Quick answer
For a typical week in London, most travellers use between 3GB and 6GB of mobile data. Light users (mostly maps and messaging) can get by on 2-3GB, while heavy streamers and remote workers should budget 8-10GB or more.
Day-by-day data breakdown
Arrival day (Heathrow/Gatwick to your hotel): Navigation apps, ride-hailing, and messaging family that you've landed. Expect 150-250MB.
Sightseeing days (Tower of London, Westminster, Camden): Maps running in the background, photo uploads to social media, and the occasional video call home. Budget 300-500MB per day.
Museum and gallery days: Mostly Wi-Fi covered indoors, so mobile usage drops to 150-300MB, largely for transit directions between stops.
Tube and bus travel: The Underground has patchy signal below ground, so most data use happens above ground, checking Citymapper or Google Maps for the next connection. Around 100-200MB daily.
Shopping days (Oxford Street, Camden Market): Price comparisons, maps, and social sharing add up to roughly 300-400MB.
Day trips out of London (Oxford, Bath, Windsor): More time on data as you're off home Wi-Fi entirely. Plan for 500MB-1GB.
Video calls or remote work: A single one-hour video call uses roughly 300-500MB, so remote workers should add 1-2GB per week just for calls.
What actually eats your data
- Google/Apple Maps navigation: ~5-10MB per hour with turn-by-turn directions
- Social media browsing (Instagram, TikTok): ~150-300MB per hour, more with video-heavy feeds
- Music streaming (Spotify, Apple Music): ~60-150MB per hour depending on quality
- Video streaming (Netflix, YouTube): ~300MB-1GB per hour depending on resolution
- Video calls (WhatsApp, FaceTime): ~300-500MB per hour
Choosing the right eSIM plan
If you're mostly sightseeing and using maps and messaging, a 3GB plan comfortably covers a week. Add streaming or remote work into the mix and 5-10GB is the safer choice, especially since most London hotels, cafes, and the Tube's above-ground stations offer free Wi-Fi to top up your usage.
With Londonesim.io, your eSIM installs before you fly, activates the moment you land at Heathrow, Gatwick, Stansted, or Luton, and there's no roaming bill shock waiting when you get home. Browse our UK data plans and pick the size that matches your itinerary.