O2 has issued a message urging all mobile phone users with old, unwanted smartphones to trade them in for a free cash boost ...

Millions of mobile phones will become "obsolete" when O2 makes a major change in just a few weeks. The provider is switching off its 3G network from April, affecting customers who use older phones.

GCHQ and the US National Security Agency hacked into the internal network of the largest makers of mobile phone ... security of mobile phones on the Vodafone, EE and O2 networks.

O2 was tricked into transferring a phone number to fraudsters, a customer has fumed. ‘Sim-swap’ fraud has affected three readers – and dealing with their mobile phone company hasn’t been ...

If you have an older phone, you may need to upgrade to one that supports 4G and 5G in order to be able to use mobile data when the switch happens. Virgin Media O2 said it would contact customers ...