I use a Sony Ericsson Equinox with my T-Mobile plan, it has unlimited text and 750 minutes but no data plan. My friend gave me a Motorla Cliq and I put my Sim Card into it, I used the WiFi connection to get on Facebook and I added my Facebook account to the apps on the home screen, I was wondering whether T-Mobile will automatically switch to their 3G Network if there isn't Wifi. My plan doesn't have data usage and if it does switch to their 3G Network does it mean that they will charge me?