Airport & Underground Coverage: Why Signal Drops and What To Do

31 Oct 2025

Travelling often means jumping from open streets into steel-and-glass terminals and deep underground platforms. It’s no surprise your bars can vanish at the worst moments: boarding passes won’t load, ride-hail pickups fail, and messages loop endlessly. Airport and metro environments are brutal for radio signals, with thick materials, interference, and rapid movement that stress even the best networks. The good news: with a little prep and the right settings, you can keep your phone usable through most weak-signal zones. In this guide, we explain exactly why coverage collapses in airports and tunnels, how modern networks try to fix it (from distributed antenna systems to femtocells and “leaky feeder” cables), and what you can do—step by step—to stay connected. We also cover Wi‑Fi calling as a fallback and what happens if you need to place an emergency call when your device shows no service. If you’re planning trips, we’ll show how the right eSIM choice helps too.

Why airports and subways kill your signal

The physics problem

Materials: Reinforced concrete, metal cladding, and low‑emissivity glass reflect and absorb mobile signals, especially higher‑frequency 4G/5G bands.
Distance and line of sight: You’re often far from macro towers, buried below street level, or behind multiple walls.
Crowds: Thousands of devices in a terminal create contention and interference; uplink (your phone to the network) becomes the bottleneck.

The mobility problem

Handoffs: Moving quickly—airport rail links, shuttles, escalators—forces frequent “handoffs” between cells. If the handoff fails or the next cell is congested, calls drop and data stalls.
Bands and tech mix: Networks may drop you from 5G to 4G to 3G/2G for coverage. Each step down can disrupt active sessions.

The infrastructure gap

Not every venue invests in indoor solutions. Where they do, systems vary:
DAS (Distributed Antenna System): A network of indoor antennas rebroadcasting outdoor cell coverage inside terminals and concourses.
Small cells/femtocells: Mini base stations installed for targeted capacity—lounges, gates, or staff areas.
In tunnels: “Leaky feeder” coaxial cables or dedicated radiating antennas carry mobile signals along the track.
Multi-operator support varies. One operator may have great signal; another may have none.

How networks try to keep you connected

Low-band spectrum: 700–800 MHz bands penetrate buildings better; you’ll often see more bars on these, though speeds may be lower.
Carrier aggregation and DSS: Combine bands or share 4G/5G to keep sessions alive as you move between cells.
VoLTE and VoWiFi: Modern calling stays on 4G/5G or falls back to Wi‑Fi calling, reducing circuit-switched handoff issues.
Priority paths: Airports sometimes prioritise back-of-house and critical services. Public areas may share limited capacity.
Emergency handling: Networks attempt to place emergency calls on any available cell, sometimes even on a rival network, depending on local regulations.

Before you go: a 10‑minute prep checklist

Install a local or regional eSIM - A multi-network or strong local profile can massively improve indoor performance. - Regional options like Esim Western Europe or Esim North America let your phone choose among partner networks. - Check country specifics on Destinations or install a country plan such as Esim United States, Esim France, Esim Italy, or Esim Spain.
Enable Wi‑Fi calling - iOS: Settings > Mobile Data > Wi‑Fi Calling. - Android (varies): Settings > Network & Internet > Mobile network > Wi‑Fi calling. - Confirm your phone shows “Wi‑Fi” or an icon in the dialler when active.
Download essentials for offline access - Boarding passes, rail tickets, hotel directions, offline maps, and translation packs. - Authentication apps: sync or note backup codes to avoid SMS dependency.
Adjust network settings - Prefer 4G/5G Auto; avoid “5G Only”. - Turn on Data Saver/Low Data Mode to handle captive Wi‑Fi and weak uplinks.
Power plan - Weak signal drains batteries fast. Start with 70%+ and carry a power bank.

Pro tip: Add airline and airport apps to “unrestricted battery” so they can load passes on flaky connections.

At the airport: practical tactics that work

Use venue connectivity wisely

Join official airport Wi‑Fi and complete the captive portal; Wi‑Fi calling may not activate until the portal is cleared.
If Wi‑Fi calling still won’t engage:
Toggle Airplane Mode on, then enable Wi‑Fi only to force calling over Wi‑Fi.
Disable VPN temporarily; some VPNs block Wi‑Fi calling’s IMS traffic.
Forget and rejoin Wi‑Fi if the portal pops up again.

Choose your spot

Near windows or open atriums generally improves signal.
Avoid dense metal structures (security lanes) and sublevels when placing important calls.
Lounges may have small cells; a quick signal check can be worthwhile.

Manage handoffs

If a call keeps dropping as you move, step aside and finish the call stationary.
For video calls, switch to audio or pause video while walking between concourses.

If data stalls but bars look fine

Try switching to 4G/LTE from 5G; some indoor DAS nodes still deliver steadier 4G.
Toggle Mobile Data off/on, or briefly toggle Airplane Mode to trigger reselection.
Manually select a different network if your eSIM allows it.

Pro tip: Some gates have better indoor coverage because they sit under newer DAS clusters. If you find one that loads fast, stay put while you upload photos or sync documents.

Underground and on the metro: what’s different

Not all lines have mobile coverage. Some systems cover platforms only, others include tunnels, and some rely purely on station Wi‑Fi.
Coverage can switch every few hundred metres as the train passes tunnel antennas, causing brief dropouts.
Speed matters: fast lines can outrun small-cell footprints, making uplink patchy.

Staying connected below ground

Make Wi‑Fi your default:
Set your phone to auto-join official metro Wi‑Fi; finish any captive portal step at the first station.
Keep Wi‑Fi calling enabled. You can often place calls and send messages between stops.
Prepare for tunnel blackouts:
Queue messages and downloads.
Use offline navigation between stations and refresh when the train stops.
For critical tasks:
Wait for a station with platform coverage.
If you must call, stand near the platform centre where antennas are typically positioned.

Pro tip: If the metro has partial coverage, switch chat apps to “low bandwidth” or audio-only modes to ride out tunnel gaps.

What if you need to call emergency services?

Your phone will attempt to place emergency calls (e.g., 112, 911, 999) on any available network, even if your own provider has no service. This behaviour depends on local regulations and device support but is widely implemented.
If you see “No Service”:
Try the emergency number anyway; the phone will scan for any cell that can carry the call.
Move towards open areas, station entrances, or near windows to improve odds.
Wi‑Fi calling and emergencies:
In many countries, emergency calls are supported over Wi‑Fi calling, but not everywhere. If Wi‑Fi is the only option, complete the captive portal and try—your phone will choose the best available path.
If Wi‑Fi calling is unavailable for emergency calls, the device will attempt cellular instead.
Location sharing:
Modern systems can transmit your location (Advanced Mobile Location/AML) when you call emergency numbers. This may not work over all Wi‑Fi networks.

Note: Rules and capabilities vary by country and operator. If in doubt, move to an area with clear cellular coverage as soon as it’s safe.

Troubleshooting quick wins

Try these in order when signal or data misbehaves:

Toggle Airplane Mode on for 10 seconds, then off.
Turn Wi‑Fi off and on; complete any captive portals.
Switch network mode to 4G/LTE and back to 5G Auto later.
Manually select a different partner network (if your eSIM allows).
Reset network settings only if the above fails (you’ll need to rejoin Wi‑Fi networks).

Pro tip: Save your eSIM QR and plan details offline before you travel in case you need to reinstall after a network reset.

Picking the right eSIM for hard-to-reach places

Prefer plans with multi-network access in your destination so your phone can latch onto the operator with the best indoor/DAS presence.
If you’re visiting multiple countries or transiting through major hubs, regional eSIMs simplify coverage:
Esim Western Europe for intra‑EU travel where metro coverage varies city by city.
Esim North America for the US and Canada, where low-band 5G/4G differs by carrier and airport DAS deployments are uneven.
Country-specific options can outperform roaming in airports with single-operator DAS:
Esim United States
Esim France
Esim Italy
Esim Spain
Check operator notes and airport/metro coverage on Destinations.

For teams on the move, pooled data and policy controls help ensure staff stay reachable in terminals and tunnels. See For Business for options. Venue and travel partners exploring indoor solutions can visit our Partner Hub.

Tech corner: femtocells, DAS, and “leaky feeders” explained

Femtocells and small cells: Low‑power base stations that improve coverage in a small area like a lounge or gate cluster. They attach to backhaul (often fibre) and broadcast licensed spectrum.
DAS: A centralised system that pulls in operator signals and redistributes them via fibre/coax to many indoor antennas. Great for large airports where uniform coverage is needed.
Leaky feeder cables: Special coax that acts like a long antenna, “leaking” RF along tunnels so trains and platforms receive consistent signal. Common in metros and long airport service tunnels.
Handoffs: Your device measures signal quality and the network commands a move to a better cell. In dense or poorly tuned systems, handoffs can fail, causing drops. Staying still during calls helps.

Fast setup steps (iOS and Android)

Force Wi‑Fi calling
iOS: Control Centre > enable Airplane Mode > turn Wi‑Fi back on > ensure “Wi‑Fi” shows in the Phone app status line.
Android: Quick Settings > Airplane Mode > enable Wi‑Fi; confirm Wi‑Fi calling icon in the dialler or status bar.
Lock to LTE temporarily
iOS: Settings > Mobile Data > Voice & Data > 4G.
Android: Settings > Network & Internet > Mobile network > Preferred network type > LTE/4G.
Switch networks
iOS: Settings > Mobile Data > Network Selection > turn off Automatic and pick another partner.
Android: Settings > Mobile network > Network operators > Search networks.

Pro tip: After leaving the airport or surfacing from the metro, return to Automatic network selection and 5G Auto.

FAQs

Why do I have full bars but no data in an airport?
Indoor systems can show strong signal but be congested on the backhaul or uplink. Try switching to 4G/LTE, move to a quieter spot, or use airport Wi‑Fi with Wi‑Fi calling.
Does 5G work underground?
Often only low‑band 5G or 4G is deployed in tunnels. High‑band 5G (especially mmWave) struggles with penetration and is rare below ground.
Will Wi‑Fi calling charge me roaming fees?
Wi‑Fi calling uses the internet, not cellular roaming, but call billing depends on your home operator. For data, airport Wi‑Fi is typically free or time‑limited. Using a local eSIM avoids surprises.
Can I rely on emergency calls without mobile coverage?
Your phone will try any available cellular network for an emergency call. It may also attempt the call over Wi‑Fi if supported. This is common but not guaranteed everywhere.
Why does my battery drain faster in terminals and tunnels?
Phones boost transmit power and scan more aggressively when signal is weak. Use Low Power Mode, keep a power bank handy, and prefer Wi‑Fi when available.
Should I turn off 5G to save battery indoors?
Sometimes. If 5G is weak or inconsistent, locking to 4G can stabilise connectivity and reduce scanning.

The bottom line

Airports and underground systems are challenging radio environments. Expect reflections, rapid handoffs, and capacity crunches—then prepare accordingly: enable Wi‑Fi calling, carry a multi‑network eSIM, download essentials for offline use, and know a few quick toggles to recover service when it falters. With the right setup, you’ll get your boarding pass, message your pickup, and place calls even when your bars dip.

Next step: Choose a regional plan that keeps you covered across borders and terminals. Start with Esim Western Europe.

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Andes Highlights (3 Weeks): Peru–Bolivia–Chile–Argentina Connectivity

Planning a south america itinerary 3 weeks through the high Andes? This route stitches together Peru’s Sacred Valley, Bolivia’s La Paz and Salar de Uyuni, Chile’s Atacama Desert, and northern Argentina’s quebradas or Mendoza wine country—often by long-distance bus and a couple of short flights. Connectivity is different at altitude: coverage is strong in cities but drops in high passes and salt flats; bus Wi‑Fi is patchy; border towns can be blackspots. The smart move is an eSIM with multi‑country coverage, backed by offline maps, offline translations, and a simple routine for crossing borders by bus without losing service. Below you’ll find a practical, connectivity-first itinerary; checklists to prep your phone, apps and documents; and on-the-ground tips for staying online where it matters: booking transport, hailing taxis, backing up photos, and navigating when the signal disappears.If you’re transiting via Europe or North America, you can also add a layover eSIM to stay connected door-to-door. Start with our country list on Destinations, then follow the steps, and you won’t waste time chasing SIM shops at 3,500 metres.The 3‑week Andes route at a glanceWeek 1: Peru (Cusco, Sacred Valley, Machu Picchu) - Fly into Cusco (or Lima then connect). - Base in Cusco; day trips to Pisac/Chinchero/Maras–Moray. - Train to Aguas Calientes; Machu Picchu visit; return to Cusco or continue to Puno/Lake Titicaca.Week 2: Bolivia and Chile (La Paz, Uyuni, San Pedro de Atacama) - Bus/collectivo via Copacabana to La Paz. - Fly or overnight bus to Uyuni. - 3‑day Uyuni–altiplano tour ending in San Pedro de Atacama (Chile).Week 3: Chile and Argentina (Atacama to Salta or Mendoza/Buenos Aires) - Choose: - North: San Pedro to Salta/Jujuy by bus; fly to Buenos Aires. - Or South: San Pedro–Calama flight to Santiago; bus or flight to Mendoza; onward to Buenos Aires.Connectivity notes (quick): - Cities: generally strong 4G/4G+; 5G in major hubs (Santiago, Buenos Aires). - Altitude/rural: expect long no‑signal stretches (Uyuni, altiplano passes, Paso Jama). - Bus Wi‑Fi: often advertised, rarely reliable. Plan to be offline onboard. - Border regions: networks switch; a multi‑country eSIM avoids sudden loss.eSIM vs local SIMs for a 4‑country tripFor a route with multiple borders and remote legs, eSIM wins on time and reliability.What a multi‑country eSIM gets you: - One plan across Peru, Bolivia, Chile, Argentina (check coverage per country on Destinations). - No passport/SIM registration queues at kiosks. - Keep your home number active on the physical SIM for calls/SMS codes. - Instant top‑ups if you burn data on photos or navigation.When a local SIM still helps: - Long stay in one country with heavy data use (e.g., a month in Buenos Aires). - Dead zones where a different local network performs better (rarely worth the hassle on a 3‑week pace).Practical approach: - Use an eSIM as your primary data line across all four countries. - If you find a specific local network far better in one region, add a cheap local SIM and keep the eSIM as backup.Device readiness checklist (before you fly)1) Check eSIM compatibility and SIM‑lock status on your phone.2) Buy and install your eSIM while on home Wi‑Fi. Keep a PDF/printed copy of the QR code.3) Label lines clearly (e.g., “eSIM Andes Data”, “Home SIM”).4) Turn on data roaming for the eSIM; leave roaming off for your home SIM to avoid charges.5) Set up dual‑SIM rules: data on eSIM; calls/SMS default to home SIM if needed.6) Download offline: Google Maps/Organic Maps for all target regions; language packs (Spanish at minimum); bus/air tickets; hotel confirmations.7) Cloud backups: set to upload on Wi‑Fi only; pre‑create shared albums for travel companions.8) Test tethering/hotspot with your laptop/tablet.If you’re transiting popular hubs, consider a short layover eSIM: - USA connections: add an Esim United States or a broader Esim North America.- Europe connections: Madrid/Barcelona? Use an Esim Spain. Paris or Rome? See Esim France and Esim Italy. Multi‑country layovers? Try Esim Western Europe.City‑by‑city connectivity notesCusco & the Sacred Valley (Peru)Coverage: Good in Cusco city; variable in high villages (Maras/Moray) and along Inca Trail approaches.Tips: Download Sacred Valley maps offline; pin viewpoints and ruins. most taxis use WhatsApp—save your accommodation’s number.Machu Picchu/Aguas Calientes: Patchy to none at the citadel. Upload your photos later; don’t rely on live ticket retrieval.Lake Titicaca: Puno and CopacabanaPuno: Reasonable 4G; bus terminals crowded—screenshot QR tickets.Crossing to Copacabana: Expect a signal drop around the border; have directions saved offline.La Paz (Bolivia)Good urban 4G; the cable car network has decent signal but tunnels do not.Yungas/“Death Road” tours: Mountain valleys cause dead zones—share your emergency contacts with the operator, carry a charged power bank, and don’t plan remote calls.Uyuni and the Altiplano (Bolivia to Chile)Uyuni town: OK 4G; ATMs finicky—use Wi‑Fi for banking apps.Salt flats/lagunas: Assume offline for most of the 3‑day tour. Guides often carry satellite phones; agree a pickup time/place in San Pedro and preload your map route.San Pedro de Atacama (Chile)Town: Solid 4G; accommodations often have Wi‑Fi but speeds vary.Geysers, Valle de la Luna: Offline navigation essential; sunrise trips start before mobile networks wake up in some areas.Salta/Jujuy or Mendoza/Buenos Aires (Argentina)Salta/Jujuy: Good city coverage; quebradas have long no‑signal sections.Mendoza: City 4G/5G; vineyards outside town can be patchy.Buenos Aires: Strong 4G/5G; ideal for cloud backups and large downloads before you fly home.Border crossings by bus: step‑by‑stepThe big ones on this route: Peru–Bolivia (Puno/Copacabana), Bolivia–Chile (Uyuni–San Pedro via Hito Cajón), Chile–Argentina (Paso Jama to Salta or Los Libertadores to Mendoza).How to keep service and sanity:1) The day before:- Top up your eSIM data.- Confirm your plan includes both countries you’re entering/leaving.- Download offline maps for both sides of the border and your town of arrival.- Save bus company WhatsApp and terminal address offline.2) On departure morning:- Keep a paper copy or offline PDF of tickets, insurance, and accommodation proof.- Charge phone and power bank; pack a short cable in your daypack.3) On the bus:- Don’t count on bus Wi‑Fi. Keep your eSIM as primary, but expect drops near mountain passes.- If your phone supports it, enable “Wi‑Fi calling” for later when you reach accommodation Wi‑Fi.4) At the border posts:- Data may be unavailable. Keep QR codes and booking numbers offline.- After exiting one country and entering the next, toggle Airplane Mode off/on to re‑register on the new network.- If the eSIM doesn’t attach, manually select a network in Mobile Settings.5) Arrival:- Send your accommodation a quick WhatsApp when you’re back online.- Recheck your eSIM’s data roaming is on; confirm you’re on an in‑country network, not a weak roaming partner.Pro tips: - Dual profiles: If your eSIM allows, keep a secondary profile for a different network in the same country—helpful in border towns.- Cash buffer: Some border terminals don’t accept cards; download a currency converter for offline use.Offline survival kit (5‑minute setup)Maps: Download regions for Cusco, Sacred Valley, Puno, La Paz, Uyuni, San Pedro, Salta/Jujuy or Mendoza, and Buenos Aires.Translations: Download Spanish for offline use; add phrasebook favourites (bus tickets, directions, dietary needs).Documents: Save PDFs of passports, tickets, hotel addresses; star them for quick access.Rides: Screenshots of pickup points; pin bus terminals and hotel doors.Entertainment: Podcasts and playlists for long bus legs, set to download on Wi‑Fi only.Altitude and your tech: what changesCoverage gaps lengthen: Fewer towers at high altitude; valleys can block signal. Assume offline on remote excursions.Batteries drain faster in cold: Keep your phone warm and carry a power bank (10,000–20,000 mAh).Hotel Wi‑Fi may be congested: Schedule big uploads (photo backups, app updates) for big-city stays like Santiago or Buenos Aires.GPS still works offline: Your blue dot shows on offline maps without data—preload everything.Data budgeting for 3 weeksTypical traveller usage across this route: - Messaging/Maps/Bookings: 0.2–0.5 GB/day- Social and photo sharing: 0.3–0.7 GB/day- Occasional video calls/streaming: 0.5–1.0 GB/dayFor a mixed-use trip, plan 15–25 GB for 3 weeks. Heavy creators should double it and upload over hotel Wi‑Fi when possible. If you work remotely, consider a higher‑capacity plan and a backup eSIM; see our guidance on For Business.Practical route with transport and connectivity cuesDays 1–4 Cusco base: Strong city signal; day trips may be spotty—go offline-ready.Days 5–6 Machu Picchu: Expect no service at the ruins; sync tickets ahead.Days 7–8 Puno to La Paz via Copacabana: Border signal drop; re‑register networks after crossing.Days 9–11 Uyuni tour to San Pedro: Treat as offline; charge nightly; carry spare cables.Days 12–14 San Pedro: Stable in town; tours offline; top up data before Paso Jama.Days 15–17 Salta/Jujuy or Mendoza: Good urban 4G; rural patches are offline.Days 18–21 Buenos Aires: Strongest connectivity of the trip; clear your uploads and map downloads for the flight home.Partnering and stopover extrasHospitality and tour operators in the Andes: help your guests stay connected—explore co‑branded solutions via our Partner Hub.Transatlantic flyers: test your eSIM setup on a layover with an Esim United States or Esim Western Europe before hitting high-altitude blackspots.FAQs1) Do I need a local SIM in each country?No. A multi‑country eSIM covering Peru, Bolivia, Chile and Argentina is simpler and works well for a 3‑week pace. Consider a local SIM only if you’ll spend longer in one country and want the absolute best regional coverage.2) Will my WhatsApp number change with an eSIM?No. WhatsApp is tied to your registered number, not your data line. Keep your home SIM active for voice/SMS (roaming off if you wish), and use the eSIM for data—WhatsApp continues as normal.3) Can I hotspot to my laptop or camera?Yes. Enable tethering on your eSIM. Mind your data: cloud backups and OS updates can burn gigabytes—set them to Wi‑Fi only or schedule in big cities.4) What if there’s no signal on the Uyuni/Atacama legs?That’s expected. GPS still works offline. Pre-download maps and translations, carry a power bank, and sync plans with your tour operator before departure.5) Will I get roaming charges at borders?If you’re using a multi‑country eSIM with coverage in both countries, you won’t incur extra roaming fees from your home carrier. Keep roaming off on your home SIM to avoid accidental use.6) I’m connecting via Europe or the US—worth getting a layover eSIM?Yes. It’s an easy way to test your setup and stay reachable. Try Esim North America or country options like Esim Spain, Esim France, or Esim Italy for common hubs.Next step: Browse South America coverage options and build your plan on Destinations.

31 Oct 2025

Transfer Your eSIM to a New iPhone (eSIM Quick Transfer)

Moving to a new iPhone and want your mobile plan to come with you? If you use an eSIM, Apple’s eSIM Quick Transfer makes it fast to move your plan on‑device—no plastic SIM, no store visit. This guide explains the smoothest way to transfer your eSIM during setup or afterwards in Settings, plus what to do if Quick Transfer isn’t supported by your carrier. We’ll cover when to delete the old profile, how to check for carrier locks, and the small settings that keep travellers online abroad without bill shock.Whether you’re switching right before a trip or juggling multiple travel eSIMs (for example, a Esim United States for a New York conference and an Esim Western Europe for a summer rail pass), follow these steps to keep service uninterrupted. If Quick Transfer isn’t available, you can still move your plan using a QR code or a reissued eSIM from your provider.What you’ll need before you startRun through this short checklist to avoid mid‑transfer snags:Compatible iPhones:iPhone XS/XR or later support eSIM. US models of iPhone 14 and later are eSIM‑only (no physical SIM tray).iOS up to date on both devices (ideally iOS 17 or later).Both phones charged (30%+), Wi‑Fi and Bluetooth turned on, and placed side‑by‑side.You know the device passcodes and Apple ID login (helps with Quick Start, though Apple ID is not strictly required for Quick Transfer in Settings).Old iPhone not erased and the eSIM profile still present.Carrier supports eSIM on both devices, and supports eSIM Quick Transfer. If not, use the QR/reissue route below.Unlocked phones if you plan to use international eSIMs:Check on each iPhone: Settings > General > About > Carrier Lock. “No SIM restrictions” means unlocked.If you’re travelling:Confirm your plan or travel eSIM is valid for your destination (browse Destinations, including Esim North America, Esim France, Esim Italy, or Esim Spain).Pro tip: Never delete the eSIM from your old iPhone until the new phone shows a signal and data works. Deleting too early can strand your number and require a carrier reissue.Option 1: Transfer your eSIM during new iPhone setup (Quick Start)This is the cleanest approach when unboxing a new iPhone.1) Power on the new iPhone and place it next to your old one.2) On the old iPhone, tap Continue when the Quick Start prompt appears.3) Scan the swirling animation on the new iPhone using the old iPhone’s camera.4) Follow on‑screen steps until you reach “Transfer your mobile plan” or “Set up eSIM.”5) Choose the line(s) to transfer. If you use multiple eSIMs (e.g., a primary number plus a travel data eSIM), you’ll see each line listed.6) Approve on the old iPhone and wait while the plan moves to the new iPhone. Keep both devices unlocked and nearby.7) When prompted, set your default line for Voice and Data, and label your lines (e.g., “Personal UK” and “Travel EU”).8) Finish setup, then test: - Toggle Airplane Mode off, confirm bars appear. - Open a webpage to confirm mobile data. - If needed, enable Data Roaming for your travel eSIM (Settings > Mobile Data > your eSIM > Data Roaming).Pro tips: - Travelling soon? Set your travel eSIM as “Mobile Data” and your home SIM as “Voice” to keep calls/SMS on your usual number while using local data abroad. - To avoid accidental roaming charges, keep Data Roaming off on your home line when abroad and only enable it on your travel eSIM.Option 2: Transfer after setup (eSIM Quick Transfer in Settings)If you’ve already finished setup, you can still move the eSIM on‑device.1) On the new iPhone, go to: - Settings > Mobile Data (or Cellular) > Add eSIM. - Tap “Transfer From Nearby iPhone.”2) On the old iPhone, confirm the transfer when prompted and select the line to move.3) Wait for activation to complete on the new iPhone. Stay on Wi‑Fi and keep Bluetooth on.4) Test calls/data as above. If your travel eSIM is for a region such as Esim Western Europe, toggle Data Roaming on only when you arrive in‑region.5) Only after testing, remove the old eSIM profile from the old iPhone: - Settings > Mobile Data > tap the plan > Remove eSIM.If “Transfer From Nearby iPhone” doesn’t appear or fails, your carrier may not support Quick Transfer. Use the QR/reissue method below.Option 3: Use a QR code or eSIM reissue when Quick Transfer isn’t availableUse this when: - Your carrier doesn’t support Quick Transfer. - Your old iPhone is lost, stolen, or no longer turns on. - You’re switching between ecosystems (iPhone to Android, or vice versa).How to proceed:1) Request a new eSIM (reissue) from your carrier or eSIM provider. - They’ll send a fresh QR code or SM‑DP+ server and activation code. - Some providers charge a small replacement fee or require identity verification.2) On the new iPhone, install the eSIM: - Settings > Mobile Data > Add eSIM > Use QR Code. - Scan the QR or tap “Enter Details Manually” to input the SM‑DP+ address and activation code.3) Wait for activation, then test calls/data.4) Once confirmed working on the new iPhone, remove the old eSIM from the old device if it’s still in your possession: - Settings > Mobile Data > select the plan > Remove eSIM.Traveller note: If you’re lining up a trip, you can add a travel eSIM in advance, then toggle it on when you land. Browse regional options like Esim United States, Esim France, or Esim Spain under Destinations.When should you delete the eSIM from your old iPhone?Only delete after the new iPhone: - Shows signal bars for that line. - Can place/receive a call (if it’s a voice line). - Loads a web page on mobile data (if it’s a data line). - Roams correctly in your destination if you’re abroad.Why this matters: Deleting early can sever the link to your number or data plan. If something goes wrong, you’ll need a reissue from your carrier, which can take time—annoying if you’re at an airport.If you plan to trade‑in or sell the old iPhone: - Remove the eSIM, sign out of Apple ID, and erase all content only after confirming the line is active on the new device.Configure your lines after transfer (recommended for travellers)After the move, fine‑tune these settings:Labels:Settings > Mobile Data > each plan > Mobile Plan Label.Use clear names like “Home” and “Trip – Italy/France.”Default line and data line:Choose which line handles Voice and which handles Mobile Data.For trips, set your travel eSIM as the data line; keep home line for calls/SMS.Data Roaming:On for the travel eSIM, off for your home line when abroad.Network selection:If coverage is patchy, try manual network selection under your travel eSIM settings.Some regional plans (e.g., Esim Western Europe) roam across multiple partner networks—manual selection can help in fringe areas.Personal Hotspot:If you plan to tether laptops or tablets, ensure your plan supports it and toggle on. Useful for remote work trips—see For Business if you manage teams on the road.Troubleshooting: common eSIM transfer errors“Transfer not supported by your carrier”Use the QR/reissue method. Contact your carrier or eSIM provider for a new activation code.“Cannot complete cellular plan change” or activation stallsUpdate iOS on both devices.Reboot both phones, keep them on Wi‑Fi, and retry.Check time/date are set automatically.Reset Network Settings (Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings), then try again.No signal after transferToggle Airplane Mode off/on.Ensure the plan is enabled in Settings > Mobile Data.For travel eSIMs, enable Data Roaming and check APN settings provided by your eSIM provider.Try manual network selection temporarily.eSIM missing after restoring from iCloudeSIMs are not included in iCloud or iTunes backups. You must transfer via Quick Transfer or reinstall via QR/reissue.Carrier lock blocks activationCheck Carrier Lock status under Settings > General > About. If locked, the device may only accept that carrier’s eSIM. Request an unlock if eligible.Business or multi‑device rolloutsIf you deploy iPhones for teams, standardise your process:Keep devices on the latest iOS and confirm unlock status before travel.Maintain a secure record of eSIM QR codes/activation details for reissue scenarios.Train staff to transfer via Settings > Add eSIM > Transfer From Nearby iPhone.For recurring travel (events, rotations), consider regional packs such as Esim North America or Esim Western Europe. Explore centralised options via For Business and partner resources in the Partner Hub.FAQsCan I transfer an eSIM if my old iPhone is dead or lost?Not via Quick Transfer. Ask your carrier or eSIM provider for a reissue/QR and activate it on the new iPhone.Does an iCloud backup move my eSIM?No. eSIMs are not included in backups. Use Quick Transfer or reinstall using a QR/activation code.Do I need the same Apple ID on both iPhones?No for Quick Transfer in Settings, but being signed in enables the smoother Quick Start flow during setup. You’ll still need both phones nearby and unlocked.Can I move an eSIM from iPhone to Android (or back)?There’s no cross‑platform “Quick Transfer.” You must remove/deactivate the old eSIM and install a new one on the other device using a QR/activation code from your provider.Will this work abroad without Wi‑Fi?The transfer needs local connectivity and Bluetooth; Wi‑Fi is strongly recommended. If you’re already travelling, use hotel or airport Wi‑Fi for a stable transfer.Which iPhones support eSIM?iPhone XS/XR and later. US iPhone 14 and newer are eSIM‑only. Check your carrier’s eSIM support and device unlock status before buying a travel eSIM.Key takeawaysUse Quick Start during setup or “Transfer From Nearby iPhone” in Settings for the fastest, no‑QR move.Don’t delete the old eSIM until the new iPhone is fully working on that line.If Quick Transfer isn’t supported or the old phone is unavailable, request a QR/reissue from your provider.Travellers should set the travel eSIM as the data line and keep Data Roaming off on the home line.Check device unlock status early to avoid surprises when buying regional eSIMs like Esim Italy or Esim United States.Next step: Planning a trip? Pick the right regional plan now in Destinations.

30 Oct 2025

Lost or Stolen Phone Abroad: Step‑by‑Step Playbook (iOS & Android)

When your phone disappears on the road, minutes matter. Your device holds maps, payments, messages, photos, boarding passes and the keys to your accounts. This practical playbook prioritises fast actions that stop thieves from accessing your data, block mobile service misuse, and put you on the front foot for recovery or insurance. Whether you’re on iPhone or Android, start by remotely locking the device, then secure your number and accounts, document everything, and get reconnected quickly with a replacement handset and eSIM. You’ll also find pro tips to make your next trip far safer, from enabling Find My/Find Device and backup, to setting SIM PINs and storing your IMEI. If you’re replacing your device on the move, we’ve included options to get instant connectivity via regional eSIMs (e.g., Esim Western Europe or Esim North America). Keep calm, follow the steps, and you’ll minimise disruption and risk.Step 1: Lock down the phone in the first 10 minutesPrioritise account and data safety over recovery. Only attempt in‑person retrieval if it’s unquestionably safe. Do not confront suspected thieves.iPhone: Use Find MyUse any browser (iCloud.com/find) or another Apple device.Sign in to iCloud with your Apple ID.Select the missing iPhone. If it’s online, you’ll see its location.Mark as Lost: - Locks the device with a passcode. - Disables Apple Pay. - Lets you display a message and a callback number (use a trusted number that’s not your own lost phone).If sensitive data is at risk or the phone is unlikely to be recovered, Erase iPhone remotely. - Note: After erasing, you can’t track the phone’s live location, but Activation Lock prevents re‑use without your Apple ID.Turn on Notify When Found to get a location alert if it comes online.Remove the device from your Apple ID only after you’ve fully given up recovery and finished any insurance process.Pro tips: - If you set up Stolen Device Protection (iOS 17.3+), certain changes now require Face ID/Touch ID and a security delay away from familiar locations. - You can see device details (serial/IMEI) in your Apple ID account under Devices—useful for insurance.Android: Use Find My DeviceOn a browser, go to google.com/android/find and sign in to the Google account on your phone.Select the device. If online, you’ll see its location or last seen.Secure Device: - Locks the phone and signs you out of Google on the device. - Lets you display a message and callback number.If recovery is unlikely, Erase Device remotely. - Note: After erasing, you can’t track it further. Factory reset protection may still deter reuse depending on brand.If supported and enabled, the Find My Device network can help locate some devices even when offline.Pro tips: - Remove contactless cards from Google Wallet at pay.google.com > Payment methods. - Keep screenshots of the Find My Device actions; they help with insurance.Step 2: Protect your mobile service (SIM/eSIM)Your phone number is the gateway to SMS codes and calls. Lock it down next.Contact your mobile operator or eSIM provider immediately to suspend the line. - Ask for a temporary suspension to block calls/data and prevent SIM‑swap attacks. - For physical SIMs, suspension stops misuse if the card is removed. - For eSIMs, suspension blocks the profile on the stolen device.Request a replacement SIM/eSIM for your new or spare device. - Some providers let you re‑download the eSIM profile to a new phone via their app/portal.If you use a travel eSIM, keep your order ID and QR code handy. Many plans can be reissued to a replacement handset on the road.Reconnecting options with Simology: - Travelling in the region? Get back online fast with Esim Western Europe, Esim France, Esim Italy or Esim Spain. - In the US or Canada/Mexico? See Esim United States and Esim North America. - Unsure which plan fits? Browse coverage on Destinations.What support might ask for: - Your phone number and plan details. - Order number/ICCID (for eSIM). - IMEI of the lost device and the IMEI of your replacement device.Step 3: Secure your accounts and moneyStop unauthorised access while you organise a replacement.Change your Apple ID/Google account password first, then email, banking, social, and travel accounts.Review and revoke active sessions:Apple ID: Settings > Your Name > Password & Security > Manage devices.Google: myaccount.google.com > Security > Your devices and Recent security activity.Rotate two‑factor authentication:Move 2FA from SMS to an authenticator app or passkeys where available.Update recovery email/phone numbers if your number is impacted.Disable contactless cards:Apple: Mark as Lost disables Apple Pay, but also remove cards via your Apple ID if you’re concerned.Google: Remove cards at pay.google.com and your bank’s app.Messaging apps:WhatsApp: Register your number on a new device to log out the old one; if you can’t, email support@whatsapp.com with “Lost/Stolen: Please deactivate my account.”Signal/Telegram: Install on your new device to invalidate the old session and review linked devices.Banking/fintech:Freeze cards in your banking app and re‑issue new cards if needed.Review recent transactions and set up alerts.Pro tips: - Prioritise email first; it’s the reset path for most services. - Use strong, unique passwords and a password manager. Change the master password if it was stored on the lost device without strong device encryption/passcode.Step 4: Document and report for insuranceInsurers need evidence and timelines. Start your paper trail early.File a local police report as soon as is safe to do so (ideally within 24 hours). Bring:Device make/model, colour, distinguishing marks.IMEI/serial number.Date/time and place of loss/theft, and any case numbers.Gather documents:Proof of purchase (receipt/invoice).Photos of the device and accessories (if you have them).Screenshots or emails showing Find My/Find Device actions and status.Travel proof (boarding pass/hotel booking) if your policy requires it.Notify your travel insurer and follow their claim form. Ask exactly what they require and any deadlines.If a police report isn’t possible (e.g., remote location), document why and record any alternative official report you can obtain (e.g., hotel/transport incident logs).Finding your IMEI without the phone: - Check the original box or receipt. - Apple: appleid.apple.com > Sign in > Devices. - Google/Android: Some manufacturers show device info in your Google account; your mobile operator may have it on file.Pro tips: - Keep copies in cloud storage you can access from any device. - Don’t erase the device until you’ve captured any last‑known location you might need for the report—balance this with security risk.Step 5: Replace your phone and get back onlineYou don’t need to wait until you’re home.Borrow or buy a local handset:Ensure it’s unlocked and eSIM‑capable if you plan to use an eSIM.Mid‑range Android devices are widely available and affordable in most cities.Restore your data:iPhone: Restore from iCloud or a recent Finder/iTunes backup.Android: Restore from Google One/Drive backup during setup.Reconnect with eSIM:Re‑download your plan from your provider app or QR code.Or choose a new plan matched to where you are or heading next via Destinations, including Esim Western Europe, Esim United States, Esim France, Esim Italy, Esim Spain or Esim North America.Verify your restored device:Re‑enable Face ID/Touch ID and a strong passcode.Re‑set up 2FA/authenticator apps and confirm recovery methods.Re‑add payment cards to Apple Pay/Google Wallet and test a low‑value transaction.For team travellers: - Centralise line suspensions and device replacements via your IT/admin. If you manage staff on the road, explore For Business for easier eSIM provisioning and controls, and our Partner Hub if you’re a travel partner supporting customers.Step 6: Prevent it next time – a 10‑minute pre‑travel checklistDo this before every trip.Enable device location and recovery:iPhone: Settings > Your Name > Find My > Find My iPhone (On). Turn on Send Last Location.Android: Settings > Security & privacy > Find My Device (On).Turn on automatic cloud backups for photos, messages and app data.Use a strong passcode and biometrics. Disable lock‑screen previews and Control Centre/Quick Settings access from the lock screen.Enable Stolen Device Protection (iOS 17.3+) and review your Google account’s security checks.Set a SIM PIN to prevent SIM profile use if removed from the phone.Record IMEI and serial number; store in secure cloud notes you can access without the phone.Store eSIM QR codes/order details securely for quick re‑download.Move critical 2FA away from SMS to an authenticator app or passkeys, and add recovery contacts.Keep travel insurance policy numbers and claim contacts handy.Consider a slim cross‑body or zipped pocket; use “do not disturb” pockets in crowds.Pro tips: - Add a lock‑screen message with an email address and a reward note. Genuine finders do exist. - Keep a small “backup kit”: old unlocked handset, printed QR codes, spare power bank.FAQ1) I didn’t enable Find My/Find Device. Is there anything I can do? - Yes: immediately change your Apple ID/Google password, suspend your line with your operator/eSIM provider, and secure your accounts. File a police report and proceed with insurance. You won’t be able to live‑track the device, but account lockdowns still protect you.2) Can thieves use my eSIM or make calls? - If your line is active, they can use data and receive SMS codes. Suspend the line right away. A SIM PIN helps, but suspension is the sure fix. For eSIMs, suspension blocks the profile on that device.3) Should I erase my phone remotely? - If recovery seems unlikely or sensitive data is at risk, yes. Be aware you cannot track it afterwards. iPhone’s Activation Lock and Android’s factory reset protection still deter reuse without your account credentials.4) How do I find my IMEI after the phone is gone? - Check the device box/receipt, your Apple ID Devices list, your Google account/device portal (where supported), or ask your mobile operator. Save it in your travel notes next time.5) Do I need a police report for insurance? - Most travel insurers require a timely report for theft claims. Obtain one as soon as practical and keep copies of all supporting evidence (Find My screenshots, receipts, boarding passes). Ask your insurer exactly what they need.6) Is it safe to go to the map location and retrieve my phone? - Prioritise personal safety. Avoid confronting suspects. If the phone appears to be moving or in a private property, share details with local authorities and your insurer rather than intervening yourself.—Next step: Get reconnected fast with the right travel plan for where you are. Explore Destinations.

30 Oct 2025