Getting connected in London is easy, with strong competition among carriers keeping prices reasonable.
Major Carriers
EE, O2, Vodafone, and Three are the four major UK carriers, all with shops across London where you can get a prepaid SIM with just ID — no address proof required for a basic prepaid plan.
eSIM Options
Most major carriers now offer eSIM alongside Airalo and Holafly’s UK-specific plans — a good option to arrive already connected, particularly useful given the UK’s post-Brexit exit from EU roaming agreements.
Prepaid Plans
Prepaid SIMs are competitively priced — expect to pay £10–20/month for a generous data allowance (20GB+), with Giffgaff and Three often cited for particularly good value among budget-conscious buyers.
Where to Buy
- All major carriers have shops at Heathrow, Gatwick, and other London airports, though slightly pricier than city locations.
- Supermarkets like Tesco and Sainsbury’s sell their own MVNO SIMs (Tesco Mobile, etc.) at competitive rates.
- Online ordering with delivery to your accommodation is common and often the cheapest option if you’re not in a rush.
The Bottom Line
London has some of the most competitively priced mobile plans among major world capitals — a prepaid SIM with generous data is easy to find for under £15/month.
Frequently Asked Questions
Does my UK SIM work when I travel to the EU?
Not automatically since Brexit — some carriers still offer free EU roaming as a plan feature, but check specifically, as it’s no longer a blanket guarantee the way it was pre-Brexit.