I bought an HTC Glacier and hoped to use GrooveIP/Google Voice and free wifi for the majority of my calls. I also bought a Tmobile prepaid card to use when I am out of a wifi area. I also downloaded the app Pinger to use for sending and receiving text messages.

I can remove the SIM card from the phone and everything works as it should, albeit a bit slowly. When the card is in the phone and I use GrooveIP and/or Pinger, everything works but if I look online my prepaid account is being reduced even though I am not using Tmobile' system.

I looked through the various settings and cannot determine what might be causing this to happen. Has anyone dealt with a similar problem and could you offer a solution?