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

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Throttling & Fair‑Use Policies: What “...

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

30 Oct 2025

Networks
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/tethering
  • A Fair‑Use Policy that applies especially when roaming

Once 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 busy

Carriers 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 practice

FUPs 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 in
  • Roaming FUP: 5–30 GB at full speed in a foreign country, then slower speeds or deprioritisation
  • Daily high‑speed passes: 1–5 GB per day, then 1–3 Mbps until midnight
  • Hotspot allowances: 5–50 GB at full speed; after that, tethering may be banned or throttled

These 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 shaping

Two 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 Difference

These 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 region

These are indicative ranges to help set expectations. Always review plan specifics on the product page.

  • United States / North America
  • Premium data on “unlimited”: commonly 30–100 GB before deprioritisation
  • Hotspot: 5–50 GB at full speed; then slower or disabled
  • Post‑FUP throttle: 128–512 kbps on some budget plans; others keep full speed but deprioritise
  • See 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 common
  • Daily unlimited passes: 1–5 GB/day at full speed then 1–3 Mbps
  • Hotspot limits vary; check if tethering is included in the FUP
  • See Esim Western Europe, plus country pages like Esim France, Esim Italy and Esim Spain.
  • Multi‑country trips
  • Regional 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:

  1. Check your usage in the app/portal - Look for “premium data used”, “hotspot used”, or “FUP reached” messages.
  2. 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.
  3. Toggle network modes - Switch 5G to 4G (LTE), or vice versa. Sometimes a less crowded 4G band beats congested 5G.
  4. Move 100–300 metres - Try a different street corner or side of the building. Cell boundaries and load change quickly.
  5. Test with and without VPN - A VPN won’t fix volume‑based throttles, but it can neutralise app‑specific shaping. Compare results.
  6. 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 slowdowns

Follow these steps before and during your trip:

  1. 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.
  2. 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.
  3. Keep hotspot usage intentional - Download large files over hotel Wi‑Fi. - If you must tether, reduce video quality and pause cloud backups.
  4. 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.
  5. 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.
  6. 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.
  7. 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 travellers

If 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” plan

  • Is 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.

FAQ

Q: 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.

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

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
Press Roundup: Simology in the News (Q4 2025)

Press Roundup: Simology in the News (Q4 2025)

Q4 2025 was a busy season for Simology. Reporters, reviewers and travel editors zeroed in on two things: how quickly travellers can get connected with an eSIM before landing, and how to keep costs predictable during multi-country trips. This roundup summarises the themes in Simology press coverage from October to December, the product updates journalists highlighted, and a few quote snippets from our spokespersons that you may have seen. If you’re a writer on deadline, you’ll also find a practical media kit checklist and useful links to our most-requested pages, including Destinations, regional plan overviews such as Esim United States and Esim Western Europe, and our Partner Hub for assets and brand guidance. For business travel desks and ops teams, we’ve included pointers to For Business with team features, invoicing and centralised spend controls. Let’s get into what the media asked, what we shipped, and where to find the details fast.Where Simology showed up this quarterThe quarter’s coverage clustered around three practical use cases: short US trips, city breaks in Western Europe, and multi-stop itineraries across North America.North America: predictable connectivity for short staysEditors focussed on simple activation flows and predictable costs for domestic and cross-border travel.Useful links readers bookmarked:Esim United StatesEsim North AmericaCommon angles:“Install before you fly; switch on after landing.”“No surprise roaming add-ons from home carriers.”“Coverage that follows you across borders on one plan.”Western Europe: one plan, many countriesTravel desks emphasised the practicality of using a single eSIM for multiple countries, particularly over long weekends and rail itineraries.Popular pages cited:Esim Western EuropeEsim FranceEsim ItalyEsim SpainCommon angles:“No queueing for physical SIMs on arrival.”“Keep your primary number active for calls; use data on the eSIM.”“Clear allowances, easy top-ups mid-trip.”What journalists asked (and how we answered)Below are concise, on-record snippets from Simology spokespeople that appeared in Q4 pieces. Use them if you’re looking for fast, accurate phrasing.“An eSIM is simply a digital SIM. You scan a QR code, download the plan, and your phone adds a second data line in minutes.”“Our traveller-first approach is: show the networks up front, show the speeds you can expect, and make the total price obvious.”“For multi-country trips, a regional eSIM avoids the airport SIM shuffle. One plan, one dashboard, one top-up.”“Business teams want control without micromanaging devices. That’s why our admin console adds spend caps, shared wallets and consolidated invoices.”“We design for ‘install at home, switch on on arrival.’ That’s the easiest path to a smooth landing with maps, ride-hailing and messaging live.”Product updates the press highlighted in Q4Q4 saw a series of upgrades designed to make purchase, activation and management quieter and simpler. Here are the updates media tended to showcase:Cleaner activation flowQR code and install code both supported.Live preflight checks confirm device compatibility and OS settings before you pay.Smarter regional plan selectionDestination pages now recommend single-country vs regional bundles based on itinerary length.Regional plans cover border areas more reliably, helpful on rail and road trips.Business featuresTeam workspaces with central billing and one-click assignment.Exportable usage reports for finance.Policy tools to set data limits per user or per trip. See For Business.Partner resourcesUpdated logo suite, app screenshots and messaging guidelines. See the Partner Hub.Faster affiliate approvals and clearer deep-link parameters.Quick start checklist: install a Simology eSIM in under 2 minutesCheck your device supports eSIM and is carrier-unlocked.Choose your destination:Single country: e.g., Esim United States, Esim France, Esim Italy, Esim Spain.Multi-country: Esim Western Europe or Esim North America.Buy the plan; keep the QR code or activation code handy.On iPhone: Settings > Mobile Data > Add eSIM > Use QR/Activation code.On Android (may vary): Settings > Network & Internet > SIMs > Add eSIM > Use QR/Activation code.Label the new line “Travel Data,” set it as the data line, and leave your primary line for calls.Toggle “Data Roaming” on for the eSIM line. Leave primary line roaming off to avoid home-carrier charges.Land, switch airplane mode off, and your data should be live. If not, restart once.Pro tip: Install before you fly. Activation doesn’t start the clock; first network use does.The themes that drove coverageJournalists anchored their stories around a handful of practicality-first questions. Here’s how those mapped to what travellers care about.Can I keep my WhatsApp number? Yes. Your primary SIM/number remains. The eSIM supplies data only. Messaging apps continue as usual.Will I get 5G? Where available on the local network. Destination pages note expected network types. See Destinations for specifics.Is a regional pass worth it? If your itinerary crosses borders, one regional eSIM (e.g., Esim Western Europe) avoids per-country setup, with a single allowance to manage.What about business travel? Centralised control, per-trip budgets and consolidated billing save time versus expensing ad hoc SIMs. Details on For Business.What we shared with the press: practical guidance, not hypeRather than splashy claims, we emphasised the basics that save travellers time and money.Transparent pricing: all-in plan prices shown before checkout.Network disclosure: named networks where permitted, or capability bands where not.Predictable activation: installation at home; activation on arrival.Account portability: you can store multiple eSIMs and switch as you move between regions.Pro tip: If you’re comparing offers, look beyond headline GB. Check the fair use policy, tethering rules, and whether top-ups stack or reset.How to cover Simology: a mini media kit checklistIf you’re writing or filming a Simology piece, this checklist keeps assets and facts straight.Grab updated brand assets and device screenshots from the Partner Hub.Verify device support and OS flows using our live preflight check on any destination page, e.g., Destinations.Illustrate single-country vs regional with concrete examples:City break: Esim France or Esim Italy.Multi-country rail trip: Esim Western Europe.US + Canada itinerary: Esim North America.For B2B angles, request a demo account via For Business to explore admin controls.Need quotes or a technical explainer? Contact us via the Partner Hub with your deadline and focus; we’ll respond with verified details.Pro tip: Screenshare the install flow. Readers engage well with a 30-second “scan, install, label line, toggle data” segment—they can replicate it on their own devices.Traveller checklists the media lovedCoverage often embedded simple checklists. Here are two you can reuse.Pre-trip device checklistIs your phone carrier-unlocked?Does it support eSIM? (Most recent iPhone and Android flagships do.)Have you updated to the latest OS?Have you added a payment method to your app store or card-ready wallet?Did you save the QR code/activation code somewhere you can reach offline?First-hour on the groundDisable data roaming on your primary line (to avoid home-carrier roaming).Enable data roaming on the eSIM line.Open maps, ride-hailing and messaging to confirm everything is live.If you need tethering, check the plan’s hotspot allowance on your destination page.For teams: what editors flagged for business travellersBusiness travel coverage highlighted the trade-off between control and convenience.Central purchase, local experience: Ops buys plans in bulk; travellers self-install in minutes.Budget certainty: Shared wallets and caps prevent overspend.Compliance-friendly: Single monthly invoice with per-user breakdown.Global-ready: Mix regional passes across teams travelling to the US, Canada and Western Europe without juggling multiple vendors.Start here: For Business.Pro tip: Set policy at profile level (e.g., Sales 10 GB per week; Engineering 20 GB with hotspot) to cut manual approvals.Frequently asked questionsWhere can I see which countries and networks are supported?Head to Destinations for an A–Z view plus network details. For common trips, see Esim United States, Esim Western Europe and Esim North America.Do I need to wait until I land to install the eSIM?No—install at home so you’re set. Activation starts when the eSIM first connects to the local network.Can I keep my primary number active for calls and texts?Yes. Keep your primary line for calls/SMS; set the eSIM as your data line. Messaging apps continue to use your existing number.What happens if I run out of data mid-trip?You can top up from your account. Top-ups apply to the same eSIM profile and usually take effect within seconds.Is eSIM good for multi-country travel in Europe?Yes. A regional plan like Esim Western Europe covers multiple countries on one allowance and one install, so you avoid per-country SIM swaps.Do you support teams and company billing?Yes. Our business console offers centralised purchasing, allocations, spend controls and invoicing. See For Business.What’s nextIf you’re planning a trip or writing a guide, the fastest way to sense-check coverage, networks and allowances is to browse Destinations and pick your route. You’ll see plan options, setup steps and what to expect on the ground—no surprises.

31 Oct 2025
Dual‑SIM Data Steering: Best Practices for iOS & Android

Dual‑SIM Data Steering: Best Practices for iOS & Android

Travellers often juggle two priorities: staying reachable on their usual number and getting affordable, fast data abroad. Dual‑SIM (physical + eSIM or dual eSIM) makes that easy—if you set it up right. This guide shows you how to control which SIM handles voice, SMS and data, how to avoid accidental roaming charges, and how to keep apps like WhatsApp and banking OTPs working smoothly. We’ll cover iOS and Android step‑by‑step, explain default line rules, and share practical roaming presets you can apply in seconds. You’ll also find app‑specific tips and troubleshooting for common snags.If you’re new to travel eSIMs, browse country and regional options on Destinations, including ready‑to‑go packs such as Esim United States, Esim France, Esim Italy, Esim Spain, Esim Western Europe and Esim North America. Then use the dual sim data switching best practices below to keep costs down and coverage up.What “data steering” means on your phoneDual‑SIM data steering refers to how your device chooses a SIM for internet access, calls and messages, and whether it can switch between SIMs automatically. Key concepts:Default voice line: which SIM handles outgoing calls by default.Default SMS line: which SIM sends texts by default.Default data line: the only SIM that carries mobile data at any one time.“Allow mobile data switching” (iOS) / “Auto data switch” (Android): optionally lets the phone use the non‑data SIM for data during a call or when signal is poor.Data roaming per SIM: separate toggles to allow data outside your home network.Wi‑Fi assist / smart network switch: uses mobile data when Wi‑Fi is weak—useful, but can burn through data if you’re not careful.Your goal as a traveller is usually to keep your home SIM active for calls/SMS, and use a local/eSIM for data—without letting the phone sneak data onto the wrong SIM.Quick presets for travellersApply these simple presets to avoid bill shock and keep everything working:Pre‑trip 1. Install and label your travel eSIM. 2. Update apps and download offline maps on Wi‑Fi. 3. Confirm roaming SMS/call rates on your home SIM; disable data roaming on it.On landing 1. Set the travel eSIM as your default data line. 2. Leave your home SIM as the default for calls and SMS. 3. Turn OFF any auto data switching features to lock data to the travel eSIM. 4. Turn ON data roaming on the travel eSIM only.While travellingKeep Wi‑Fi Assist/Smart switch OFF unless you intentionally want mobile data to supplement weak Wi‑Fi.Use Low Data/Data Saver modes to reduce background usage.If you need tethering, enable Personal Hotspot on the travel eSIM.Flying homeSwitch default data back to your home SIM.Turn OFF data roaming on the travel eSIM (or disable the eSIM profile).iOS: step‑by‑step dual sim data switchingApplies to iPhone XS and newer with Dual SIM (physical + eSIM or dual eSIM).1) Install and label your eSIM - Settings > Mobile Data > Add eSIM. - Label each plan (e.g., “Home” and “Travel”). Accurate labels reduce mistakes later.2) Set default voice and SMS lines - Settings > Mobile Data > Default Voice Line: choose “Home”. - Settings > Messages > Send & Receive: ensure your home number is ticked. If you also use your Apple ID email, you can send/receive iMessages without relying on SMS activation.3) Choose your default data line - Settings > Mobile Data > Mobile Data: select “Travel”. - Mobile Data Options > Data Roaming: ON for Travel; OFF for Home.4) Control automatic data switching - Settings > Mobile Data > Allow Mobile Data Switching: - OFF if you want to lock data to the Travel eSIM and avoid accidental home‑SIM data. - ON only if you need data continuity during voice calls on the home SIM and you’re comfortable with potential switching. If you enable it, double‑check that data roaming stays OFF on the home SIM.5) Optimise data usage - Settings > Mobile Data > Mobile Data Options: - Data Mode: Low Data Mode to reduce background tasks. - Voice & Data: 5G Auto or LTE; switch to LTE if 5G is patchy or draining battery. - Settings > Mobile Data > Wi‑Fi Assist: OFF to prevent surprise usage when Wi‑Fi is weak.6) Hotspot and tethering - Settings > Personal Hotspot: enable if your travel plan supports it. Hotspot uses the current default data line.7) If data doesn’t work - Check APN: Settings > Mobile Data > your Travel plan > Mobile Data Network. Enter APN provided by your eSIM supplier if not auto‑filled. - Toggle Airplane Mode, then back. - Manually select a network: Settings > Mobile Data > Network Selection (turn off Automatic if needed and try another partner).Recommended iOS roaming preset - Default Voice Line: Home - SMS/iMessage: Home (plus Apple ID email if you like) - Mobile Data: Travel - Data Roaming: ON (Travel), OFF (Home) - Allow Mobile Data Switching: OFF - Wi‑Fi Assist: OFF - Data Mode: Low Data ModeAndroid: step‑by‑step dual sim data switchingAndroid menus vary. Below are common paths for Google Pixel (stock Android) and Samsung; other brands are similar.Pixel (Android 13+) 1) Install eSIM - Settings > Network & internet > SIMs > + Add SIM.2) Labels and defaults - Settings > Network & internet > SIMs: - Calls: set “Home” as preferred for calls. - SMS: set “Home” as preferred for texts. - Mobile data: set “Travel” as preferred.3) Roaming and switching - Tap each SIM > Roaming: - Travel: ON; Home: OFF. - Look for “Auto data switching” or similar. If present, set OFF to avoid the phone using your home SIM for data.4) Data controls - Settings > Network & internet > Internet > Data Saver: ON. - Turn off features like “Switch to mobile data automatically” if offered by your OEM.Samsung (One UI 5+) 1) Install eSIM - Settings > Connections > SIM manager > Add eSIM.2) Defaults - Settings > Connections > SIM manager: - Preferred SIMs: Calls = Home; Text messages = Home; Mobile data = Travel.3) Roaming and switching - Tap each SIM > Data roaming: Travel ON; Home OFF. - “Switch data during calls” or “Auto data switch”: set OFF to prevent unintended use of home data. - “Dual SIM always on” handles call reachability via call forwarding; it can add costs and doesn’t affect data. Use only if you understand your operator’s charges.4) Data controls - Settings > Connections > Data usage > Data saver: ON. - “Switch to mobile data/Wi‑Fi assist” under Wi‑Fi Advanced: consider OFF to avoid surprise usage.Recommended Android roaming preset - Calls/SMS: Home - Mobile data: Travel - Data roaming: ON (Travel), OFF (Home) - Auto data switching: OFF - Data Saver: ONApp‑specific tips: WhatsApp, OTPs and moreWhatsApp - Your WhatsApp account is tied to your phone number, not the data SIM. You can keep WhatsApp registered to your home number while using data from your travel eSIM. - If WhatsApp needs re‑verification while abroad, you’ll need access to your home number via SMS or voice call. Keep your home SIM active for SMS (data roaming can remain OFF). - Don’t tap “Change Number” unless you truly want to move your account to a new number.Banking OTPs and 2FA - Many banks send OTPs via SMS to your home number. Keep the home SIM active with data roaming OFF so SMS can still arrive. - If your bank supports app‑based codes or a token, set that up before travel to reduce SMS dependence.iMessage and FaceTime - iMessage can use your Apple ID email as well as your number. In Settings > Messages > Send & Receive, tick your email to keep iMessage working even if your number can’t re‑activate. - If iMessage/FaceTime tries to re‑activate using SMS, ensure your home SIM can receive SMS.Android RCS (Chat features) - Google Messages’ RCS is associated with a specific number/SIM. You can keep RCS on your home number while mobile data comes from the travel eSIM—just ensure the home SIM remains active, and RCS is registered before you go.One‑time passwords from services - Expect some OTPs to arrive via SMS with delays when roaming. Have backup methods (authenticator app, email, or app approval) where available.Troubleshooting and pro tipsLock data to the correct SIM: Turn OFF “Allow Mobile Data Switching” (iOS) or “Auto data switch” (Android) during travel.Check APN settings: If data connects but is slow or drops, verify APN is auto‑filled per your eSIM instructions.Manually change networks: In some countries, one partner network is faster. Try manual network selection on the travel eSIM.Prefer LTE when 5G is patchy: Switching to LTE can improve stability and battery life.Only one data SIM at a time: Dual‑SIM Dual Standby means two lines are active for calls/SMS, but only one can carry mobile data.Background data control: Use Low Data Mode (iOS) or Data Saver (Android). Consider restricting heavy apps to Wi‑Fi.Hotspot with care: Tethering uses your default data SIM; verify your plan allows it.Frequent flyers: Keep a “Travel” profile ready to toggle—data to Travel, data roaming OFF on Home, auto switching OFF.Regional eSIMs: Multi‑country options like Esim Western Europe or Esim North America reduce mid‑trip SIM shuffling. For single‑country trips, pick Esim United States, Esim France, Esim Italy or Esim Spain.For teams and frequent travellersIf you manage staff on the road, set a standard preset: home SIM for calls/SMS, travel eSIM for data, roaming OFF on home SIM, and auto data switching disabled. Provide a simple runbook for iOS and Android.Centralise procurement and control with pooled eSIMs and usage reporting via For Business.If you’re a reseller or travel partner, explore co‑branded solutions through our Partner Hub.FAQWill changing the data SIM affect my phone number for calls or WhatsApp?No. Your phone number for calls/SMS stays on the SIM you set for voice. WhatsApp remains tied to the number it was registered with, regardless of which SIM provides data.Can I receive SMS on my home SIM with data roaming off?Yes. SMS uses the signalling channel, not mobile data. Keep the home SIM active and data roaming OFF to receive texts without using mobile data.Should I enable “Allow Mobile Data Switching” on iPhone while abroad?Usually no. Keep it OFF to prevent accidental data usage on your home SIM. Enable only if you need uninterrupted data during calls and you’re confident your home SIM won’t incur data charges.My travel eSIM shows signal but no data. What now?Toggle Airplane Mode, check APN, and ensure Data Roaming is ON for the travel eSIM. Try manual network selection to pick an alternative partner.Can I hotspot from my travel eSIM and still receive calls on my home number?Yes. Personal Hotspot uses the current default data line (travel eSIM), while your home SIM remains active for calls and SMS.Does my phone auto‑switch data to the “better” SIM when signal is poor?Only if you enable features like “Allow Mobile Data Switching” (iOS) or “Auto data switch” (Android). For cost control while roaming, keep these OFF.Next step: Pick your destination and get a travel eSIM that fits your trip on Destinations, then apply the presets above before you fly.

31 Oct 2025