Okay, here's a little tidbit for all of you out there who are worried about the erosion of our civil liberties. In yet another blow to the privacy of ordinary citizens, the FBI revealed in a recent court case that it can use your cell phone to listen in to your conversations – even when the power is turned off:
So, to be clear, if you turn your phone off, they can still "bug" you by hacking in to your signal and digitally manipulating your phone to turn on, then listen to conversations that are within range. The only way to guard against this is to pull out the battery. Additionally, they can use the phone as a location device. The article doesn't say how, but I assume it is by triangulating tower signals.
An important part that was left out of the article was whether or not the FBI needed a warrant to do this. Given the recent NSA wiretapping flaps, I'm doubtful. Big Brother is watching!