SIM card maker admits that it never detected GCHQ hack and the loss of millions of encryption keys
Security services stole SIM card encryption keys from maker Gemalto to help hack mobile phone network
BT believes it can generate an additional £1.6bn a year in sales thanks to huge deal
BT created domino effect by acquiring EE, and now its TV rival is upping its game
O2 deal will make Three the biggest mobile operator in the UK
Hong Kong conglomerate returns fire after BT's purchase of EE
Poor mobile coverage will be rectified by refreshing existing ESN contract, with no need for an extension to mobile services contract
Telecoms giant BT vies to get back into mobile communications 12 years after it floated-off O2
Deal could be worth £10bn, but BT claims it is interested in another mobile operator's business too
Telecoms giant remains committed to nation after no vote wins debate