I have a T-Mobile SIM card, that is equipped with a full data plan. My Sidekick broke, and I have Nextel Blackberry Curve, which I put the SIM card into. The phone will not receive a phone signal. How do I get the phone to work with the T- Mobile SIM card. Please only answer this question if you are knowledgeable. I have heard of people using their SIM card on a different network phone so I know it can be done. Is there any way that I could do this?