People go to the UK to study, for trade shows and conferences in London, and to travel around Scotland and English towns. Almost everything — from the Tube to museums — is paid by card or phone, and tickets and bookings live in apps, so you need data all the time.
Networks and coverage
The main networks are EE, Vodafone, O2 and Three. Cities get fast 4G and 5G, and many London Underground lines now have mobile coverage. In the Scottish Highlands and rural England the signal is noticeably weaker.
eSIM, local SIM or roaming
A local SIM is bought on arrival, roaming without a package is expensive, while an eSIM takes a minute to buy from home: the QR code arrives instantly and your main number stays on for calls and texts. Worth knowing in the UK:
- The UK isn't in the EU: the "roam like at home" rule doesn't apply here.
- You can buy a local SIM in shops, but plans are usually monthly.
- If you're heading to Europe after London, check whether the UK is included in the regional plan.
How to prepare before you fly
- Check eSIM support: dial
*#06#— if you see an EID line, you're good. - Install the eSIM at home over Wi-Fi. For most plans the clock starts at the first connection abroad; the exact rule is on the plan card.
- Set the eSIM as your mobile data line and turn on data roaming for it.
- Turn off data roaming on your main SIM so it doesn't spend money.
Step by step, with videos: How to install an eSIM on iPhone and Android.
Trip tips
- Pay for the Tube and buses with your card or phone — no separate ticket needed.
- Trainline and Citymapper are handy for getting around the country.
- UK sockets are their own type — bring an adapter.
The ALO eSIM app also has a translator and a map: ask for directions, explain yourself at a pharmacy, find a café nearby.