Here we go and spoil it all for you. We will all be picking up the story of a certain Erica Sadun of TUAW who managed to insert a pay-as-you-go AT&T SIM card on an iPhone 3G. Everything worked out perfectly. The phone calls and the data were there. The phone has been activated with AT&T, whom with else, and it hasn’t been unlocked. Or so she says. And …