Keep WhatsApp & iMessage While Using a Data eSIM Abroad

30 Oct 2025

Travelling with a local data eSIM is the cheapest way to stay online. The worry: losing your WhatsApp or iMessage identity, missing OTPs, or triggering costly SMS activations. The good news is you can keep your home phone number on WhatsApp and iMessage while using a travel eSIM purely for data. The trick is line assignment: leave your home line for calls/SMS, set the eSIM as your data line, and avoid unnecessary reactivation prompts.

This guide shows you exactly how to do it on iPhone and Android, with step-by-step settings, what to tap when apps say “SIM changed”, and how to prepare backup codes so you’re never locked out. You’ll also find dual‑SIM examples for common trips and a quick troubleshooting section. If you’re heading to the US, Europe or beyond, pick an eSIM from Destinations and follow this playbook to keep your number, cut roaming costs, and stay reachable.

The simple rule: keep your number, switch your data

Keep your home SIM/eSIM active for calls and SMS (don’t remove it unless you’re certain you won’t need OTPs or calls).
Add a travel eSIM and assign it as the “Mobile Data”/“Preferred data” line.
Turn off data roaming on your home line to prevent surprise charges.
WhatsApp and iMessage will continue to use your home number over the travel eSIM’s internet connection.

Why this works: - WhatsApp is tied to the number you registered with, not the SIM providing data. As long as the app stays logged in and your device has internet, your WhatsApp identity stays the same. - iMessage and FaceTime can send/receive via your phone number and/or Apple ID email. Once activated on your number, iMessage continues to work over any internet connection.

Pre‑trip checklist (10 minutes now, hours saved later)

Confirm your phone is unlocked and supports eSIM/dual‑SIM.
Install critical updates for iOS/Android, WhatsApp, and Messages before you go.
Activate iMessage/FaceTime on your home number while still at home. Do not toggle iMessage off/on while abroad (it can trigger a paid international SMS).
WhatsApp:
Confirm you’re registered on your home number.
Enable two‑step verification and set your 6‑digit PIN with a recovery email.
Trigger a fresh chat backup (iCloud on iPhone, Google Drive on Android).
Two‑factor authentication:
Add an extra trusted number to your Apple ID, and note how to “Get Verification Code” from Settings offline.
For Android/Google services, generate and print/save your Google backup codes offline.
Add recovery methods for banks and key apps that send OTPs.
Decide your eSIM plan: single‑country or regional.
US trip: see Esim United States.
Western Europe: see Esim Western Europe or country packs like Esim France, Esim Italy, Esim Spain.
Multi‑country across US/Canada/Mexico: Esim North America.
Save your eSIM QR/activation details offline (PDF/screenshot in a secure note).
Label your lines clearly in your phone (Home vs Travel) to avoid slip‑ups.

Pro tip: Keep mobile data off on your home line. SMS usually works without data; you’ll still receive OTPs if your home number has roaming enabled for SMS. Check costs with your operator.

Set up on iPhone (dual‑SIM/eSIM)

1) Install and label your eSIM

Settings > Mobile Service (or Cellular) > Add eSIM.
Scan your eSIM QR or use the provider app.
When asked to label, name them clearly: - Primary or Home = your home number - Travel = your eSIM data plan

2) Assign lines for data, calls and SMS

Settings > Mobile Service: - Default Voice Line: Primary/Home (so your calls show your home number). - iMessage & FaceTime Line: Choose Primary/Home.
Mobile Data: - Set Mobile Data = Travel (eSIM). - Turn off Allow Mobile Data Switching (keeps data strictly on the eSIM).
For the Primary/Home line: - Turn off Data Roaming. - Leave the line enabled so SMS and calls can reach you.

Pro tip: For contacts who must always use your home number, set their per‑contact “Preferred Line” to Primary in the Contacts app.

3) iMessage and FaceTime settings that stick

Settings > Messages: - iMessage: ON (already activated on your home number before travel). - Send & Receive: Tick your phone number and Apple ID email. Set “Start New Conversations From” to your phone number if you want continuity, or your Apple ID email if your number can’t activate while abroad.
Settings > FaceTime: - Tick your phone number and Apple ID. Ensure your home number is active here too.

Avoid toggling iMessage or FaceTime OFF/ON while abroad. It can trigger a fresh activation SMS charged at international rates by your carrier.

4) WhatsApp: keep the same number

Open WhatsApp > Settings > Account > Two‑step verification: ensure it’s ON.
Do not use “Change Number” unless you are permanently changing numbers.
If WhatsApp shows “Did you change your number?” after it detects a SIM change, tap “No”.
If asked to re‑verify, only proceed if you can receive the SMS/voice call to your home number. Otherwise, force‑quit and reopen when you have signal for your home line or Wi‑Fi Calling.

Pro tip: Link WhatsApp Web/Companion on your laptop or tablet before you fly so you can keep chatting even if your phone is briefly offline.

Set up on Android (dual‑SIM/eSIM)

Android menus vary by brand, but the flow is similar.

1) Install and label your eSIM

Settings > Network & Internet > SIMs (or Connections > SIM Manager) > Add eSIM.
Label clearly: SIM 1 = Home, eSIM/SIM 2 = Travel.

2) Assign data, calls and SMS

Preferred SIM for:
Mobile data: Travel.
Calls: Home.
SMS: Home.
Turn off Data Roaming on the Home SIM.
Keep the Home SIM enabled so you can receive SMS/OTP.

Pro tip: Some Android phones let you choose SIM per contact in the dialler/Contacts. Set important contacts to always use your Home line.

3) Messages, RCS and Google account sanity checks

Google Messages (RCS chat features) may try to verify your number via SMS when re‑enabled. If prompted abroad, choose “Not now” to avoid a charge, or connect to Wi‑Fi with the Home SIM able to send one activation SMS.
Generate and save Google backup codes before you go, and add a recovery email/phone.

4) WhatsApp: same number, new data

Confirm WhatsApp is registered to your Home number.
Keep two‑step verification ON with your 6‑digit PIN.
If you see a SIM‑change prompt, choose “No” unless you’re truly changing numbers.
Re‑verification requires SMS/voice to your Home number; do this only when you have coverage and are comfortable with any roaming SMS cost.

Common prompts and how to respond

WhatsApp “Change number?” detected:
Choose “No”. You’re only using a different data connection, not changing identity.
iMessage wants to reactivate:
Don’t toggle iMessage/FaceTime while abroad.
If it deactivates unexpectedly, you can temporarily use your Apple ID email for send/receive, or reactivate knowing one international SMS may be charged by your carrier.
Google Messages RCS activation:
Select “Not now” and activate later on Wi‑Fi, or accept that one SMS may be sent.
SIM change notifications:
These are informational. As long as you don’t re‑register WhatsApp with a new number, your account stays tied to your Home number.

Pro tip: If you absolutely must remove your Home SIM, ensure every critical account has alternative 2FA (backup codes, authenticator app, recovery contacts) and that iMessage is set to send/receive via your Apple ID email.

Troubleshooting quick fixes

iMessage shows email instead of number:
Settings > Messages > Send & Receive: select your phone number. If it won’t tick, your Home line may lack coverage for activation. Use your Apple ID email temporarily and try activation later when the Home line has signal.
Not receiving WhatsApp codes:
Ensure the Home line is enabled and can receive SMS. Try voice call verification. If you can’t get the code, use WhatsApp Web on a linked device to stay connected until you can re‑verify.
Calls/SMS going out on the wrong line:
iPhone: Edit contact > Preferred Line, or long‑press the SIM label on the call screen.
Android: Set default SIM in the dialler or choose per call/SMS if prompted.
Data still draining on Home SIM:
iPhone: Settings > Mobile Data > turn off “Allow Mobile Data Switching”.
Android: Ensure Preferred Data SIM = Travel and Data Roaming is off on Home.
Can’t install eSIM:
Confirm your phone is carrier‑unlocked and eSIM‑capable. Reboot and retry. If travelling to the US, check compatibility with Esim United States guidance; for Europe, see Esim Western Europe.

Real‑world setups

One country, maximum simplicity:
Example: Weekend in Paris. Install a France data plan, set it as Mobile Data, keep your UK SIM for calls/SMS only. See Esim France.
Multi‑city Euro trip:
Example: Italy–Spain–France in one week. Use a regional plan so you don’t juggle multiple profiles. See Esim Western Europe or country packs like Esim Italy and Esim Spain.
North America loop:
Example: US and Canada. Use Esim North America and keep your home line for OTPs and inbound calls. If only the US, see Esim United States.
Business travellers:
Centralise policy and support so staff don’t toggle iMessage abroad or re‑register WhatsApp. Volume options are available For Business, and partners can access enablement via the Partner Hub.

Browse full coverage and plans on Destinations.

FAQ

Will people still see my usual number on WhatsApp?
Yes. WhatsApp identity stays tied to the number you registered. Using a travel eSIM only changes your data connection, not your WhatsApp number.
Do I need to use “Change Number” in WhatsApp when I travel?
No. Only use “Change Number” if you are permanently moving to a new number. For travel, keep your existing registration.
Can I remove my home SIM entirely?
You can, but you may lose access to SMS/OTP and iMessage number activation. It’s safer to keep the home line inserted and disable its data roaming. If you must remove it, set up backup codes, an authenticator app, and Apple/Google recovery options first.
Will iMessage charge me abroad?
iMessage itself uses data. However, (re)activating iMessage on a phone number can send one international SMS charged by your carrier. Activate before departure and avoid toggling while abroad.
Can I still receive SMS/OTP if data roaming is off on my home SIM?
Usually yes; SMS does not require data. Whether receiving SMS while roaming is charged depends on your carrier. Check your plan before you go.
WhatsApp asked me to verify again – what now?
Proceed only if your home number can receive the SMS/voice code. If not, wait until you have coverage or Wi‑Fi Calling, or use linked devices temporarily. Ensure two‑step verification is enabled to protect against SIM‑swap attacks.

Next step: Choose your travel eSIM and stay connected without losing your number. Start with Destinations.

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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

App Update (vX.Y): eSIM Compatibility Checker 2.0 + APN Finder

Travellers want one thing from mobile connectivity: it should just work. This simology app update focuses on removing the guesswork. In vX.Y, we’re introducing eSIM Compatibility Checker 2.0 and a new APN Finder to make sure your phone is genuinely eSIM-ready for your destination, and your data comes up first time. The upgraded checker runs a deeper device scan (on-device, privacy-first) to assess eSIM support, 4G/5G and VoLTE readiness, dual SIM limitations, and region quirks. The APN Finder pairs your device and destination with the correct Access Point Name settings and can apply them automatically on many Android devices. iPhone users get clear, per-carrier instructions.You’ll also find faster QR installs, clearer status messages, and more help built in. Where relevant, we’ve added labelled screenshots in the app’s Help and on the store listing to guide you through each step. If you’re heading to multiple countries, our regional guides—like Esim Western Europe and Esim North America—work hand-in-hand with this update for a smoother trip.What’s new in this simology app updateHere’s what’s in vX.Y:eSIM Compatibility Checker 2.0Deeper device scan for eSIM hardware/firmware supportRegion-aware 4G/5G/VoLTE readiness checksDual SIM and travel profile conflict detectionClear “Good to go / Works with caveats / Not supported” outcomesAPN Finder (new)Curated APN library for major travel carriers, refreshed dailyAuto-apply APN on many Android devices (no reboot needed)Guided APN steps for iOS with exact field valuesOffline cache for recent destinationsFaster eSIM installImproved QR and activation code parsingBetter error explanations and retry promptsSmarter destination matchingPlan hints based on your device’s 5G capability by regionWarnings for country-specific restrictions (e.g., VoLTE requirements)Privacy-first diagnosticsOn-device checks by default; optional, consented logs for supportPro tip: Combine the checker with our country pages—Esim United States, Esim France, Esim Italy, and Esim Spain—to choose the right plan for your itinerary.How eSIM Compatibility Checker 2.0 worksThe new checker verifies more than “does my phone support eSIM?” It also looks at what will work where you’re going.Step-by-step: run the checkerOpen the simology app and tap Compatibility Checker.Allow the app to read device and network capabilities (no personal data collected).Select your destination(s) or pick a regional bundle like Esim Western Europe or Esim North America.Tap Run Check.Review the results screen, which includes: - eSIM support status (hardware + OS) - 4G/5G capability and likely regional band fit - VoLTE readiness (important in countries phasing out 3G) - Dual SIM nuances (e.g., 5G may be limited to one SIM) - Recommended next steps and a link to suitable plansUnderstanding your resultGood to goYour device supports eSIM, the destination’s bands, and VoLTE/5G where applicable.Proceed to purchase and install. Expect immediate data after activation.Works with caveatsExamples: 5G not guaranteed in rural areas; VoLTE required on certain carriers; dual SIM may restrict 5G to one line.We’ll show clear notes and the best plan fit.Not supportedYour device or OS doesn’t support eSIM, or regional compatibility is too limited.We’ll suggest alternatives or upgrades.Pro tips: - Update your OS first. eSIM features often improve with the latest iOS/Android build. - If you run dual SIM, keep your primary line set to “Calls/SMS only” to prioritise data on the travel eSIM. - For multi-country trips, re-run the check for each country to catch band differences (e.g., 5G n78 in parts of Europe vs n71/n41 in North America).APN Finder: get data working first timeAPN (Access Point Name) settings tell your phone how to connect to a carrier’s data network. Many eSIMs auto-configure APNs; some don’t. APN Finder removes the guesswork.Step-by-step: apply APN with one tap (Android)In the simology app, go to APN Finder.Choose your destination and selected plan/carrier.Tap Apply APN.Confirm the change when prompted.Toggle Airplane mode off/on once; data should come up within 30 seconds.Note: Auto-apply works on most stock Android and recent Samsung/Pixel devices. If your OEM skin blocks APN edits (seen on some carrier-locked models), the app will guide you to manual entry.Step-by-step: guided APN on iPhoneOpen APN Finder in the app and select your destination.Tap View Settings to see the exact fields.On your iPhone, go to Settings > Mobile Data > your eSIM > Mobile Data Network.Enter the APN, Username, and Password exactly as shown (other fields can stay blank unless specified).Return to the main screen and toggle Mobile Data off/on.If you don’t see “Mobile Data Network,” your carrier profile may manage APNs automatically; give it a minute after activation or reboot your device.Manual APN fallback (quick checklist)Turn off Wi‑Fi while testing mobile data.Ensure Mobile Data and Data Roaming are enabled for the eSIM line.Reset network settings only if needed (this clears saved Wi‑Fi/Bluetooth).As a final step, remove and re-add the eSIM profile if activation stalled.Planning a trip? Match plan to device and regionUse the checker to align your device with the right plan. Some examples:United States: 3G shutdowns make VoLTE essential. Check your device’s VoLTE readiness and see our Esim United States guide for carrier options and 5G notes.France, Italy, Spain: Many urban areas have strong n78 5G. Rural coverage can be 4G-focused. Compare notes in Esim France, Esim Italy, and Esim Spain.Multi-country Europe: If you’ll cross borders, consider Esim Western Europe to avoid APN resets at every border.USA + Canada + Mexico: See regional options in Esim North America and run the checker for each country to confirm 5G band fit.Shortcut: Browse all supported locations in Destinations, then use the checker to validate your device before you buy.Known issues and current workaroundsWe test widely, but some OEM and OS behaviours vary. Here’s what we’re tracking:iOS manual APN visibilitySome carriers lock APN fields on iPhone. If APN fields are missing, wait 2–3 minutes after activation or reboot; the profile often autoloads. If not, our guide will confirm whether manual entry is supported.Samsung dual SIM + 5G priorityOn certain models, 5G works on only one SIM at a time. Set your travel eSIM as the “Primary SIM for mobile data” in SIM Manager. Toggle Airplane mode after switching.MIUI/ColorOS APN edit restrictionsA few builds restrict APN editing. Our APN Finder will show a manual path if available. If not, use the auto-config QR from the plan screen or contact support via in‑app Help & Feedback.Pixel VoLTE toggle locationOn some Pixels, VoLTE/4G Calling toggles are under Network & Internet > SIMs > Preferred network type. Ensure VoLTE is on in the destination country.Older Android versions (pre-11)eSIM management can be less stable. We recommend upgrading if possible before travel for smoother activation.We’ll keep this list updated as OEM updates roll out. Most hiccups are resolved by toggling Airplane mode, switching the data SIM to your travel eSIM, or re-applying APN settings.For teams and partnersManaging multiple travellers?For travel managers: bulk activation guidance, device readiness reports, and invoicing are available in For Business.For distributors and affiliates: access co-branded resources, plan catalogues, and onboarding via the Partner Hub.The checker can be used during device onboarding to pre-qualify travellers before they depart.Privacy and data handlingOn-device first: device capability checks run locally.No personal data: we don’t collect contacts, messages, or browsing data.Optional diagnostics: if you opt in while seeking support, we collect anonymised device model/OS/build and error codes to improve the tool. You can opt out any time.How to share feedbackWe build from real travel scenarios. To help us prioritise:In the app: Settings > Help & Feedback > Send feedback (attach logs if you consent).Feature requests: tag “APN Finder” or “Compatibility Checker” to route it quickly.Partners: submit requests via the Partner Hub.We review feedback weekly and publish release notes with fixes and improvements.FAQWill the checker guarantee 5G in every city?No tool can guarantee 5G everywhere. The checker validates your device’s capability and the region’s typical bands. Coverage depends on local towers and your location (e.g., indoor vs outdoor). We’ll always show when 5G is unlikely so you can set expectations.Do I need to run the checker for each country on a multi-stop trip?Yes. Bands and VoLTE policies differ by country. Run it per stop, or select a regional plan like Esim Western Europe or Esim North America and review the per-country notes.Can the APN Finder change my iPhone settings automatically?iOS typically requires manual APN entry unless the carrier profile auto-loads. The app provides exact values and a short checklist. On many Android devices, we can apply APNs with one tap.What if my device says “Not supported” but other sites claim it’s eSIM-ready?Some models have regional variants. Our check looks at your exact hardware/firmware, which may differ from the general spec sheet. If you believe it’s an error, send feedback with your model number; we’ll verify.Does the app use mobile data during checks?Checks run locally and are lightweight. If you’re fully offline, you’ll still get device-capability results; regional hints and APN lists use a cached snapshot when available.Will this update help with voice and SMS?The checker flags VoLTE readiness (critical for voice where 3G is retired). SMS behaviour depends on the plan and local network. Data connectivity remains our primary focus.Next stepPlan your route, then validate your device before you buy. Start with our full list of supported locations in Destinations, run the Compatibility Checker for each stop, and use APN Finder to bring data up on arrival.

30 Oct 2025

Throttling & Fair‑Use Policies: What “Unlimited” Really Means

Travellers love the promise of “unlimited data”, but networks define “unlimited” differently from how most of us use the word. In practice, unlimited plans almost always come with a Fair‑Use Policy (FUP) and speed management rules. Understanding these is the difference between smooth streaming in a hotel lobby and a surprise crawl when you really need maps, ride‑hailing, or boarding passes.This guide explains unlimited data throttling fair use in plain English. You’ll learn how throttling differs from deprioritisation, the typical caps you’ll see at home and while roaming, how to spot what’s happening on your line, and practical ways to avoid slowdowns on the road. We’ll also flag common gotchas—like hotspot limits and video shaping—that often hide in the small print. Planning a trip? We’ll show you how to pick a plan or travel eSIM with the right fair‑use terms for your usage, whether you’re heading to the US, Spain, Italy or across Western Europe.What “Unlimited” Really Means Today“Unlimited” almost never equals “full speed, all the time, for everything.” Most unlimited plans give you:A bucket of high‑priority or full‑speed data (often called premium data)A separate, often smaller allowance for hotspot/tetheringA Fair‑Use Policy that applies especially when roamingOnce you hit a threshold—monthly, weekly, or even daily—your speeds may be managed in two distinct ways:Throttling: your line is capped to a fixed, low speed (for example 128 kbps, 512 kbps, or 1–3 Mbps)Deprioritisation: your line stays “unlimited”, but drops in priority behind others when cells are busyCarriers use both to keep networks stable. For travellers, the impact varies enormously by location and time of day. Understanding unlimited data throttling fair use before you buy prevents surprises once you land.Fair‑Use Policies (FUP) in practiceFUPs are there to stop unusual consumption that affects other users. Typical patterns we see:Domestic unlimited: 30–100 GB of “premium” data before deprioritisation may kick inRoaming FUP: 5–30 GB at full speed in a foreign country, then slower speeds or deprioritisationDaily high‑speed passes: 1–5 GB per day, then 1–3 Mbps until midnightHotspot allowances: 5–50 GB at full speed; after that, tethering may be banned or throttledThese are ranges, not promises—always check the plan page. For region‑specific options, browse Destinations or see Esim United States, Esim Spain, Esim France, Esim Italy, Esim Western Europe and Esim North America.Hotspot and video shapingTwo limits people often miss:Hotspot/tethering: Many “unlimited” plans only include a fixed hotspot allowance. After that, tethering may be slowed or blocked.Video streaming: Some plans cap video at SD (480p) or HD (720p) using traffic shaping, regardless of your available bandwidth.If you rely on hotspot for work or need HD/4K video, choose a plan that explicitly includes it.Throttling vs Deprioritisation: Know the DifferenceThese terms are not interchangeable. Here’s how to recognise each and why it matters.Throttling (speed cap)What it is: A hard limit on your maximum speed once you hit a threshold.When it triggers: After using your premium allowance, or after hotspot/video caps, or during traffic shaping rules.How it feels: Consistently slow across locations and times—e.g., streams drop to SD, large downloads crawl, video calls struggle.Typical numbers: 128–512 kbps for heavy throttles; 1–3 Mbps for lighter management.Deprioritisation (queue position)What it is: Your traffic moves lower in the queue only when the network is congested.When it triggers: After a premium data threshold, or at busy cells (stadiums, stations, city centres at peak).How it feels: Variable. Slow at busy times/places; normal or fast at quieter cells or off‑peak hours.Typical signs: Speed tests vary widely by time and location; uploads may feel especially sluggish in crowds.Why it matters: If you’re throttled, changing time or place won’t help much. If you’re deprioritised, moving one block, switching to a less loaded band/technology (e.g., 4G to 5G or vice versa), or waiting until off‑peak can restore high speeds.Typical caps for travellers, by regionThese are indicative ranges to help set expectations. Always review plan specifics on the product page.United States / North AmericaPremium data on “unlimited”: commonly 30–100 GB before deprioritisationHotspot: 5–50 GB at full speed; then slower or disabledPost‑FUP throttle: 128–512 kbps on some budget plans; others keep full speed but deprioritiseSee Esim United States and Esim North America for travel‑friendly options.Western Europe (EU/UK)Domestic unlimited often very generous; EU‑roam FUPs of 5–35 GB are commonDaily unlimited passes: 1–5 GB/day at full speed then 1–3 MbpsHotspot limits vary; check if tethering is included in the FUPSee Esim Western Europe, plus country pages like Esim France, Esim Italy and Esim Spain.Multi‑country tripsRegional eSIMs bundle fair‑use per country or per plan. Expect FUPs in the 5–30 GB range for short trips.If you’re a power user, consider stacking plans or selecting tiers with higher premium data.How to spot slowdowns (and prove what’s happening)Use this quick, repeatable process:Check your usage in the app/portal - Look for “premium data used”, “hotspot used”, or “FUP reached” messages.Run two speed tests - One at a busy time (e.g., 6–8 pm), one off‑peak (early morning). Note ping, download, and upload. - Deprioritisation usually shows big time‑of‑day swings; throttling stays consistently capped.Toggle network modes - Switch 5G to 4G (LTE), or vice versa. Sometimes a less crowded 4G band beats congested 5G.Move 100–300 metres - Try a different street corner or side of the building. Cell boundaries and load change quickly.Test with and without VPN - A VPN won’t fix volume‑based throttles, but it can neutralise app‑specific shaping. Compare results.Try another device or SIM/eSIM if available - If the second line flies, your original line is likely managed; if both are slow, it’s probably coverage or congestion.Pro tips: - Record screenshots of usage counters and speed tests. It’s useful if you escalate with support. - If tethering is slow but on‑device usage is fine, you’ve likely hit a hotspot cap.How to avoid or minimise slowdownsFollow these steps before and during your trip:Choose the right plan tier - Prefer plans that advertise “premium data” amounts and explicit hotspot allowances. - For multi‑country trips with heavy usage, consider regional plans like Esim Western Europe or Esim North America with generous FUPs.Match the plan to your destination - In the US, capacity varies by city and carrier. Travel‑specific options on Esim United States are tuned for visitors. - In Europe, check country pages—Esim France, Esim Italy, Esim Spain—for local FUP details.Keep hotspot usage intentional - Download large files over hotel Wi‑Fi. - If you must tether, reduce video quality and pause cloud backups.Optimise your apps - Turn off auto‑updates and background sync while on mobile data. - Pre‑download offline maps and playlists before you fly. - Set streaming apps to 480p/720p on mobile; switch back to higher quality on Wi‑Fi.Manage your radios - If 5G is patchy, force 4G/LTE to avoid sticky, congested NSA 5G cells. - If upload is critical (video calls), test at different times or locations to dodge deprioritised uplink.Carry a fallback - Add a second eSIM from a different network in your dual‑SIM phone. When one is congested, switch. - For teams, pooled or centrally managed data on For Business helps ensure reliable capacity.Read the small print - Look for words like “after X GB, speeds reduced to 1 Mbps,” “video streams at SD,” or “hotspot 10 GB”.Pro tips: - City centres at lunchtime and early evenings are peak hours. Plan uploads and large downloads for mornings. - Rural areas may have excellent peak speeds but fewer carriers. Keep a secondary eSIM for redundancy.Heavy‑use and business travellersIf you’re syncing large files, running live demos, or supporting a team:Pick plans with stated premium data allowances and business‑grade hotspot limits.Use dual connectivity: one line for primary data, another as a hot backup.Consider centrally managed solutions via For Business for pooled data and support. Channel or travel partners can explore the Partner Hub.Checklist: Before you buy an “unlimited” planIs there a premium data allowance before deprioritisation? How many GB?What is the throttle speed after the FUP is reached?How much hotspot/tethering is included at full speed? What happens after?Is video streamed at a fixed resolution on mobile data?Are the FUP and hotspot limits different when roaming?Can I view real‑time usage counters in an app or portal?What networks and bands are supported at my destination?Does the plan suit my itinerary? Check regional options on Destinations.FAQQ: What’s the difference between throttling and deprioritisation? A: Throttling is a fixed speed cap imposed after you hit a limit (e.g., 512 kbps). Deprioritisation only lowers your queue position during congestion; speeds can still be fast at quieter times or places.Q: How many gigabytes can I use before I’m slowed on “unlimited” plans? A: It varies by plan and region. Common thresholds are 30–100 GB of premium data domestically, and 5–30 GB when roaming on travel eSIMs. Some plans throttle after that; others simply deprioritise.Q: Does a VPN bypass throttling or deprioritisation? A: No for volume‑based throttling and deprioritisation—they apply regardless of encryption. A VPN may help only if the network is shaping specific apps (e.g., video), not if you’ve hit a usage cap.Q: Why is my data slow even before I hit a cap? A: Likely congestion, weak signal, or sub‑optimal bands. Try another location, switch between 5G and 4G, and test at off‑peak times. Compare results to distinguish network load from policy limits.Q: Is hotspot included in unlimited plans? A: Often in limited amounts (e.g., 5–50 GB). After the hotspot allowance, tethering may be throttled or blocked. Always check the hotspot line item separately from general data.Q: Will 5G keep me safe from slowdowns? A: 5G can deliver higher peak speeds, but policy still applies. You can still be deprioritised on a busy 5G cell or throttled after hitting a FUP threshold.Next step: Plan your trip with the right fair‑use and speed terms by browsing regional options on Destinations.

30 Oct 2025