eSIM Travel Guide 2026: Internet Abroad, No Roaming
An eSIM is the single biggest quality-of-life upgrade for international travel. No swapping SIMs, no hunting for a local shop at arrivals.
You buy the data plan from your sofa, install it before you fly, and land with internet already working. No queues, no SIM tray, no kiosk. We use Saily -- made by the NordVPN team, built-in security, clean flat pricing.
The old way: land, switch off airplane mode, watch the roaming charges pile up before you reach passport control.
The eSIM way: data already running before you stand up from your seat. Maps, Uber, WhatsApp -- all working before passport control.
Modern phone, eSIM provider app, five minutes. That's the entire setup. No SIM tray tool required.
Mobile data abroad used to be the most stressful, most expensive part of arriving anywhere new. You'd land, switch your phone off airplane mode, and wait to see if your network had "helpfully" rolled you into a £6-a-day roaming bundle, or whether you were about to accidentally rack up a £200 bill checking your inbox. Then everyone learned about local SIM cards, which was better but meant queueing at a kiosk in the arrivals hall while jet-lagged and pretending you knew how to mime "data, not calls."
eSIMs solve all of that. You buy a data plan from your sofa before you fly, scan a QR code, and your phone has working internet the moment you land. No physical card to swap, no kiosks, no panic. This is the guide that explains what they are, which app to use, and the bits that nobody tells you.
"The moment you land and immediately have data -- no queue, no SIM tray, no tiny plastic card to lose -- is genuinely satisfying." GO PAC team, tested across Europe, Southeast Asia, the UAE, and beyond
What an eSIM actually is
A SIM card is the little chip in your phone that tells your phone which network it belongs to. An eSIM is the same thing, except it's a digital profile stored on a chip already built into your phone. Instead of buying a physical card and swapping it in, you buy a data plan from an app, scan a QR code, and your phone downloads the SIM profile directly.
The clever part for travellers: your normal UK SIM stays exactly where it is, doing its normal job. The travel eSIM sits alongside it as a second line, just for data. You keep your UK number for receiving calls, texts, banking codes, and 2FA prompts. The travel eSIM handles all the data -- maps, WhatsApp, Instagram, hailing an Uber, looking up the closest iced coffee. Two SIMs at once, one phone, no swapping anything.
Almost every phone made in the last five years supports eSIMs. iPhones from the XS onwards (2018), most Samsung Galaxies from the S20, Google Pixels from the Pixel 3. To check, on iPhone go to Settings then Mobile Data then Add eSIM. On Android, search "eSIM" in settings. If the option exists, you're set.
Why an eSIM beats every other option
vs. your network's roaming bundle: Most UK networks now charge £2--£7 a day for roaming in the EU, more elsewhere. A weekend in Lisbon costs £20+ in roaming. A two-week trip to Thailand costs upwards of £80. A Saily eSIM for the same trips costs about £4 and £15 respectively. The maths is brutal.
vs. a physical local SIM: Local SIMs are still the cheapest option in absolute terms, but you have to queue, hand over your passport, navigate a language barrier, and physically swap the card. For most trips, the cost saving doesn't justify the faff.
vs. a portable WiFi hotspot: Hotspots are extra hardware to carry and charge, only work for whoever's near them, and rental fees over a fortnight usually exceed an eSIM. eSIMs win for solo and small-group trips every time.
Always weigh your bag at home before you leave, every airline's carry-on limit is different, and the gate scale is the worst place to find out yours is over.
Why we use Saily
Saily is made by Nord Security -- the same company behind NordVPN. That parentage is the pitch. eSIMs route every byte of your mobile data through someone, and trusting that "someone" is exactly the kind of decision Nord's reputation makes easy. Plans cover 150+ countries with simple flat pricing and built-in web protection on every plan.
Browse Saily eSIMs → (affiliate link)
How eSIM travel rates overall
Should you switch to an eSIM?
Find out if an eSIM is right for how you travel
How do you currently get data when travelling abroad?
How often do you travel internationally?
Do you use Google Maps, Uber, or WhatsApp when you arrive somewhere new?
Pack one outfit you can re-wear: dark colours, quick-dry, no logos. It's your "things went sideways" backup and it weighs almost nothing.
eSIM vs physical SIM swap
✓ eSIM
- Set up at home before you fly
- Data working the moment you land
- Keep your UK number active simultaneously
- No SIM tray, no tiny plastic card
- Flat predictable pricing
✗ Physical SIM swap
- Queue at a kiosk at arrivals, jet-lagged
- No data until you've bought and installed it
- UK number goes dark while the foreign SIM is in
- Easy to lose, break, or misplace
- Language barrier at point of purchase
How to set up an eSIM before you travel
✦ Pre-trip eSIM checklist
The gotchas nobody mentions
Most travel eSIM plans are data-only. No phone number, no SMS, no calls -- this applies to Saily, Airalo, and most others. Fine for 99% of travellers because everyone uses WhatsApp and iMessage now. UK bank 2FA codes still arrive on your UK SIM on the same phone -- you don't lose that.
Activation is one-way for most plans. Once you activate a plan, the validity period starts counting down. Install the eSIM early; activate it when you land. This distinction matters a lot.
Removing an eSIM is permanent. If you delete a travel eSIM from your phone, you can't reinstall it -- even if it still has data left. Just leave it sitting inactive once you're done with it. It doesn't use battery or data.
Not all plans include tethering. If you need to hotspot a laptop, check the plan details before buying. Regional plans often allow it; some country-specific plans don't.
Frequently asked questions
Most modern smartphones support eSIM. On iPhone: everything from the XS onwards (2018). On Android: Samsung Galaxy S20 onwards, Google Pixel 3 onwards, most Huawei flagships from 2019 (though check individual models). To confirm on iPhone, go to Settings then Mobile Data then Add eSIM -- if that option exists, you're supported. On Android, search "eSIM" in your settings. If you're unsure about a specific model, search "[your phone model] eSIM support" and the answer comes up immediately.
For most travellers: Saily (made by Nord Security, built-in security features, 150+ countries, flat pricing -- our recommendation), Airalo (largest marketplace, 200+ countries, good if Saily doesn't cover your destination), and Holafly (best for heavy data users who want unlimited plans charged per day rather than per GB). Your phone manufacturer's built-in eSIM service (Apple, Google, Samsung) is convenient but almost always more expensive -- third-party providers undercut them universally.
Yes -- this is one of the key advantages over swapping a physical SIM. Your UK SIM (whether physical or eSIM) stays active as a second line on your phone, set to handle calls and SMS. The travel eSIM handles data only. UK calls, texts, and banking 2FA codes all still arrive on your UK number normally. You don't need to tell anyone your number has changed, because it hasn't.
Travel eSIMs are almost universally data-only -- no local phone number, no local calls, no local SMS. For most travellers in 2026, this isn't a problem: WhatsApp, FaceTime, and iMessage handle almost all calls and messages over the data connection. The only scenario where it matters is if you specifically need a local number -- to call a local restaurant, book a taxi by phone, or receive SMS from local services. In that case, a physical local SIM is still the better tool. For almost everyone else, data-only is all you need.
First: check you've actually activated the plan in your phone's settings (Settings then Mobile Data then select the eSIM as your data line -- it's installed but not active by default). Second: toggle airplane mode on and off to force a network connection. Third: in Settings then Mobile Data, make sure "Data Roaming" is enabled for the eSIM line (it's usually off by default). If it still doesn't work, check the eSIM provider's app for a support chat -- Saily and Airalo both have 24/7 support. As a last resort: hotel WiFi will get you online to sort it out.
Made by the NordVPN team. Flat pricing, built-in security, 150+ countries. Buy it from your sofa, install it before you fly, land with data already working. Browse Saily eSIMs → (affiliate link)
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