Remember System X?
A vast amount of money was wasted on System X, devloped just so that any call could be tapped automatically and remotely.
Noone else in the world thought this an acceptable idea so it didn't sell.
So now BT are worried? Bunch of incompetent hypocrites.
And as for their track record on mobile networks:
They had Cellnet and screwed it up to the point where it was disposed of in a fire sale. Now they plan to wreck EE.