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Mobile phone coverage checker

Search by postcode or place, and check if you are well covered by 4G and 3G.

TPO running on the network rated the UK's most reliable, 7 quarters in a row*

*Source: YouGov SMIX Wave 26 published March 2016

If your phone is already unlocked everything should work perfectly. If your phone is locked to the Three network you’ll need to arrange to have it unlocked - see more here.


We’re not just about SIM card plans and good causes - we’re also dedicated to bringing you the best mobile service. TPO runs on Three, the network built for the mobile internet, which means you can look forward to:

Talk and text just about anywhere     Very few dropped calls

Texts delivered straight away     Be able to use data pretty much all the time

Quicker downloads on 4G     ✓ Little or no buffering or stalling