T-Mobile US CSO: Spies jumped from one telco to another in a way 'I've not seen in my career'

Security chief talks to El Reg as Feds urge everyone to use encrypted chat
Interview While Chinese-government-backed spies maintained access to US telecommunications providers' networks for months – and in some cases still haven't been booted out – T-Mobile US thwarted successful attacks on its systems 'within a single-digit number of days,' according to the carrier's security boss Jeff Simon.…