Quick answer: an eSIM beats standard roaming for almost every trip outside Europe, where UK networks commonly charge £5 to £8 a day just to use your existing number abroad. A week-long eSIM with enough data for maps and messaging typically costs £6 to £25 depending on the destination, so it usually pays for itself within the first two or three days. Roaming still makes sense in a handful of specific cases covered below.
Roaming is your home network letting your existing SIM connect abroad, usually at a daily or per-megabyte charge, while an eSIM is a separate digital profile from a different, often local, provider that you install before you travel and switch to for data once you land.
Instead of swapping a physical SIM card, you scan a QR code and install a digital profile on your phone before you fly. It activates the moment you land and connect to a local network, so there's no hunting for a SIM shop or fumbling with a SIM tool at the airport. Your original UK SIM stays in the phone the whole time, so calls and texts on your usual number keep working exactly as before, while the eSIM handles data separately.
Most phones from the last five or six years support it, including every iPhone from the XS onwards, Samsung's Galaxy S range from 2019 onwards, and Google Pixel 3 and later. Check yours under Settings > General > About on an iPhone, or Settings > Connections > SIM Manager on a Samsung.
| eSIM | UK roaming | Local physical SIM | |
|---|---|---|---|
| Setup | Install before you fly, works on landing | Already active, no setup | Buy and register on arrival |
| Typical cost, 1 week outside Europe | £6 to £25 | £35 to £56 (£5 to £8/day) | Often cheapest by the gigabyte |
| Keeps your UK number active | Yes, runs alongside it | Yes | No, unless you keep the UK SIM in a second slot |
| Requires ID or a shop visit | No | No | Usually yes, passport and a queue |
For most trips outside the EU, where roaming isn't covered by the old EU-style caps, an eSIM tends to win comfortably. UK carriers commonly charge £5 to £8 a day for roaming in destinations like Turkey, Saudi Arabia, Morocco and most of Asia and North Africa, and that adds up fast over a week or two. An eSIM with a realistic data allowance for the same trip usually lands well under half that total cost, sometimes far less, while also giving you a locally routed connection that can be faster and more reliable than roaming onto a partner network abroad.
It's also the more convenient option if you land somewhere unfamiliar and want data working immediately, rather than hunting for WiFi to sort a plan after you've already arrived.
If your phone doesn't support eSIM, which is mostly older or budget handsets, roaming is the simpler fallback. It's also worth sticking with roaming if your UK plan already includes generous or unlimited roaming in your specific destination, which is increasingly common on some contracts for EU travel, or if you need calls and texts on your usual number to work seamlessly without thinking about which SIM is active for what. For a short trip of a day or two, the setup time for an eSIM sometimes isn't worth it either, though the cost saving usually still is.
For most non-EU destinations, yes, often by a wide margin. Within the EU, some UK contracts already include roaming at no extra daily charge, in which case roaming can work out just as cheap or cheaper.
Yes. The eSIM handles data on a local network while your physical UK SIM stays active for calls and texts on your usual number, both running at once with no extra setup.
You'll need either UK roaming or a physical local SIM card bought on arrival. Physical SIMs are usually the cheapest option by the gigabyte, but require ID, a shop visit and sometimes a queue.
No, only for the initial setup. Once the profile is installed and you've landed, it connects to the local network directly like a normal SIM, no WiFi required.
TravAir has dedicated, provider-by-provider comparisons for Saudi Arabia, Turkey and Morocco, covering exact pricing and network coverage for each.
See TravAir's Travel Essentials page for eSIM options vetted for common destinations, or check the country-specific guides above if you already know where you're headed.
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