Comment This is the real 'internet kill switch' (Score 2, Insightful) 139
They cant realistically kill the line ( "you cant stop the signal" ), but if you disable every access device known to man it would have the same effect... Killing every phone ( and soon tablets ) in one swoop would go a long way towards that goal.
This also gets around adhoc and private mesh networks that the feds have no real access to control.