So, when Wi-Fi isn't on, my iPhone's GPRS/EDGE service is constantly on. I don't know much about wireless technology, but doesn't this technically mean I'm data roaming on a data service that my carrier will charge me for? How do I disable it? Also, I read somewhere that the iPhone uses EDGE to send text messages, and thus it can't be avoided. That's ridiculous. Why am I being charged exorbitant data rates (I'm on Fido in Canada) just to send text messages? Can anybody enlighten me?