Following a tariff overhaul by T-Mobile last month, O2 is the latest network to revamp its monthly contracts. The original home of the iPhone is launching a new SIM-only tariff and updating its ...

A lot of phone networks are offering deals on their SIM-only contracts at the moment, and O2 has joined the long list with an impressive pay-as-you-go SIM-only sale that's on right now. These are some ...