So after a long and rocky relationship with Sprint, I had a brief stint with MetroPCS (not as bad as people say it is) and now on my way to T-Mo (after seriously considering Amp'd; for the no contract Hybrid plan, not for customer service.. I barely call in anyways).

My Q is this: can you swap out the SIM card inbetween phones and not be charged obscene amounts of cash? I want to get one of the free phones and later on get a unlocked GSM phone. Will there be any problems? Will TMO try to extend my contract, charge extra fees, etc?