Hey all. Long story short, I have an inactivated iPhone 3G (v4.2.1). My current phone is a POS freebie from AT&T. I'd like to transplant the SIM from the freebie into my iPhone, thereby gaining the ability to make calls from my iPhone without needing to purchase an overpriced data plan. I have experience jailbreaking and understand that this will be more complicated than just putting the SIM into my iPhone. I'm guessing I'll need to activate the iPhone manually somehow, but I'd like a bit of guidance before attempting the transplant. Thanks in advance for any help!