I want to purchase a g1 with a 2 yr agreement on tmobile.com. It says that they will ship the phone to you, and then after it arrives you call t-mobile to activate data service. My question is what will happen if i dont call t-mobile? What exactly does buying it online do? I assume it extends your contract for 2 years, but im not sure. Basically i want to know what happens if you dont call t-mobile after it arrives. Thanks