giffgaff
Cheap UK SIM card on the O2 network — get a UK phone number from anywhere.
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My Experience
giffgaff is the most popular choice among indie developers who need a UK phone number. It runs on O2's network, so coverage and reliability are solid, and plans start at just £6/month.
The process is straightforward — order a SIM card online (they ship to freight forwarders), activate it when it arrives, and you've got a working UK number. I used giffgaff when setting up a UK LTD and it worked perfectly for verification calls.
If you only need a UK number occasionally, the £6/month pay-as-you-go plan is the cheapest way to keep one active.
Pros
- +Runs on O2 network with excellent UK coverage
- +Plans start at £6/month with generous data allowances
- +No contract, cancel anytime
- +Can ship SIM to a freight forwarder
Cons
- −SIM card shipping takes 1-2 weeks internationally
- −UK number only — not ideal for US service verification
- −Requires activation in the UK or with a UK VPN for some features
- −Customer support is community-based, no phone support
Best For
Developers who need a UK phone number for UK company registration or service accounts.
