Sorry, but I'm sitting her chuckling at the original post. Kinda reminds me of years ago when I was working nights as control room operator at the local tv station. One night our transmitter totally died, and the backup transmitter wouldn't come online, leaving us totally dark and off the air. An irate woman called the station, and since it was after hours, I was the only one there, I answered - to be yelled at and chewed out because her screen had gone black. I patiently tried to explain that our transmitter had gone off the air, and we were doing our best to get it back on the air as soon as possible. To this she responded, still in her irate tone of voice, "well if you're off the air the LEAST you could do would be to put a message on my screen so I'd know!!!
Gee, just how do you reply to that?
I almost said, "well lady, I opened the back door and yelled as loud as I could!" But I decided it was probably easier to just say "I'll do my best to have a picture on your screen again as soon as possible, thanks" and hang up quickly.
To the original poster - the only way cell phones communicate is through the radio. If you shut it off - just how do you think you're going to place/receive calls and text messages, anyway?