I want to get a prepaid plan. I have an iPhone 3G 16GB Black version. I have hacktivated it because I had no sim car, jailbroken, and installed ultrasn0w via Cydia, so im pretty sure it's unlocked. I know that I want to use Tmobile's prepaid pay by the day plan. I just don't know what I do to activate the sim and whatnot. Can someone give me a step by step process to activating the tmobile sim card with the iPhone and having me be able to make calls and send/recieve SMS? Any help will be appreciated.