Android Apps Q&A: Is it cool to buy an iPhone 3Gs but use a prepaid SIM card?

Hey- I was in the U.S. last year with my unlocked and jailbroken 3GS, and for awhile, I had no problem with a pre-paid ATT card – and they also had a data plan which was not so expensive. But then, the Edge started not working, so I just used it with the Wi-Fi at …