Can I get a T-Mobile G1 without contract (ebay), but buy a prepaid phone service...

[Rare-1]

...and use that service in a G1? Just a possible question about T-Mobile (NYSE: DT) service with the G1. I am currently not a T-Mobile customer. But I am interested in the G1. T-Mobile actually just became available to North Carolina (where I live) due to the merger with Suncom. My question is, let's say I get a T-Mobile prepaid phone...Of course I get a 7-digit number, pay as you go, and I'm sure some sort of sim card or something inside the phone right? Then purchase an unlocked, pre-ordered, no contract G1...Will I be able to get use the phone with the prepaid service? Of course minus the 3G data plan and internet stuff? Since the phone is WIFI i rather use that when available or at my home/office or if I go to a place that has open WIFI. Would this trick work to TOTALLY avoid the T-Mobile contracts? Or is there another way? If you know someone that knows, could you please ask and pass the info my way? Thanks alot.