My sprint contract is almost up and I am going to go to a prepaid service.
I am looking at T-Mobile or AT&T Prepaid.

I am wanting to get a Iphone/ Iphone3GS, Sidekick, Google HTC or some really nice and instead of a contract use prepaid sim.

How would I go about doing that.
Can I just buy a T-Mobile phone, Take out the sim card and add a prepaid sim card to the phone and go about my business?

Also can I use a verizon droid prepaid?

See More: Prepaid Cell Phone?