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This map shows O2's 3G coverage in the UK.
It is the most thinly covered map in the series. Ofcom has in the past threatened O2 with a fine for not rolling out its network quickly enough to fulfil its 3G licence conditions.
This map shows T-Mobile's 3G coverage in the UK.
This map shows Orange's 3G coverage in the UK, which appears to be second only to 3's network in its extent.