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United Kingdom travel guide

Emergency numbers, how to stay online, and the apps locals use. Save this page before you fly.

Emergency numbers

Tap a number to call it.

Emergency999

Mobile data in United Kingdom

  • Good 4G and growing 5G in towns and cities.
  • Signal can be weak in the Scottish Highlands, rural Wales and on some train lines.
  • Your eSIM connects as roaming on local networks, so turn on Data Roaming for it when you land. There are no extra roaming charges.

Useful apps

  • Citymapper: the easiest way to get around London
  • TfL Go: London Underground maps and live times
  • Trainline: buy train tickets across the UK
  • Uber and Bolt: rides in London and other big cities

Good to know

  • On London buses and the Underground, tap a contactless card or your phone to pay. No ticket needed.
  • Call 111 for urgent medical help that is not an emergency, and 101 for police help that is not urgent. 112 also works for emergencies.

United Kingdom eSIM plans

1 GB for 7 days

$1.14

3 GB for 30 days

$2.88

Unlimited for 3 days

$3.61

See all United Kingdom plans →

Get this guide by email

We will email you this guide, plus one reminder before you fly to install your eSIM.

Stay online from the moment you land

Install your eSIM at home on Wi-Fi. Your plan only starts when it first connects to a network in United Kingdom.

Get a United Kingdom eSIM

Checked on 2026-10-22. Numbers and rules can change, so please check locally when you arrive. In a life-threatening emergency, call the local emergency number right away.