Internet in London: eSIM & Connectivity Tips
eSIM from 1,00 USD · 100 MB. Networks: 3 (5G), O2 (5G), Vodafone (5G).
Connectivity in London
What you need to know: Excellent coverage; deep Tube lines now getting 4G on most of the network.
Known weak-signal spots in United Kingdom
- Scottish Highlands and islands (Skye, Outer Hebrides)
- Welsh mountains and Snowdonia
- Remote Cornish coastline and Dartmoor
- Deep countryside and some rail tunnels
Apps you'll need
- Ride-hailing: Uber, Bolt, Black cab apps — you need live data to book and track rides.
- Maps: Google Maps, Citymapper (cities). Download offline maps for the area before leaving your hotel.
- Messaging: WhatsApp, iMessage uses only ~30 MB/hr of active chat.
Practical tip
Indoor coverage in London (shopping centres, old buildings, underground areas) is often weaker than outdoors. If you lose signal inside, step outside or connect to venue Wi-Fi. For day trips outside the city, download offline maps in advance and don't rely solely on mobile data.