It is the mobile network service used by millions of people around the UK. But O2 has now issued a warning to customers ahead of a major change that will stop some phones from working. The UK's 3G ...

A flaw in O2 UK's implementation of VoLTE and WiFi Calling technologies could allow anyone to expose the general location of a person and other identifiers by calling the target. The problem was ...

O2 has announced it is giving Pay Monthly subscribers the chance to upgrade their smartphones to its advanced 5G+ connectivity, but it will require users who haven’t already got a newer SIM or an eSIM ...