I've had my celly on while flying every now and then. I can even get a signal, especially while circling around some busy airport. My friend is a private pilot, he flies Cessnas; he tells me he texts while flying all the time. He also says he doesn't talk because it cuts in and out (that's issues with the celly signal, not issues with the plane's communications).

I always wondered about this anyway, if it was really that dangerous to have your phone switched on during take off wouldn't the airline companies take more precautions to make sure?
I have tried leaving my phone on on plenty of flights and am pleased to say the plane has never dropped out of the sky. 
Is it really dangerous or not..?