eSIMs are the cleaner solution if your phone supports them. No physical card swap, no risk of losing your UK SIM, and you can set it up before you leave home. The trade-off is cost: eSIM data plans are typically more expensive than buying a physical SIM locally.

Does Your Phone Support eSIM?

Most flagship phones from 2020 onwards support eSIM. iPhone XS and later, Samsung Galaxy S20 and later, Google Pixel 3 and later. Some budget Android phones do not. Check in your Settings under SIM or Mobile Data to confirm.

In the US market, iPhone 14 and later are eSIM-only. In the UK, most iPhones still ship with a physical SIM slot alongside eSIM capability.

Your phone must also be unlocked to use a third-party eSIM. If you bought your phone on a network contract, check whether it is unlocked. Most UK networks unlock phones after the contract term.

Airalo

Airalo is the most widely used eSIM marketplace. You buy a data plan for a specific country or region, download the eSIM profile to your phone, and activate it when you arrive.

Pricing example: a 1GB Europe-wide eSIM from Airalo costs around £4-£5. A 5GB plan is around £13-£16. These are data-only plans: no calls or texts included, which is fine for most travellers.

Airalo supports most major phones and the setup takes about 5 minutes. The Europe-wide regional plan covers 39+ countries, which is useful for multi-country trips.

Holafly

Holafly offers unlimited data plans rather than capped data. A 7-day unlimited Europe plan costs around £17-£19. For 15 days it is around £28-£30.

The "unlimited" designation comes with a fair-use policy and speeds may be throttled after a threshold, but for normal travel use it holds up well. Holafly is a stronger choice if you are streaming, using Google Maps heavily, or travelling for longer than a week.

eSIM vs Physical SIM: The Decision

Choose eSIM if: your phone supports it, you want everything set up before you leave, you do not want to swap physical cards, or you are doing a short city break where a cheap local SIM is not worth the hassle.

Choose a physical local SIM if: you want the cheapest data option, your phone does not support eSIM, or you are staying long enough (2 weeks+) that a local tourist SIM's better value justifies the faff.

Stick with your UK plan if: you are on Three with Go Roam, or your trip is short enough that a daily roaming fee (£2/day on EE) is cheaper than any SIM purchase.

For a long weekend in one city: eSIM is the most convenient option. Buy it the night before you fly, activate it when you land, and your UK number stays live in the background.