Hey all -- quick question regarding AT&T activation. I'm planning to go to an AT&T store tomorrow and pick up an iPhone 3GS. I'm on a family plan which has three numbers. Line A is eligible for an upgrade, while line B isn't. I want to get the iPhone on line B. I know I can get the iPhone on line A and transfer it over to line B, but the problem is, the person who has line A won't have time to go to the store, meaning that we'll have swapped numbers for a period of time. I want to avoid this. Can I purchase an iPhone on one line, but activate it on another? I'm going to an AT&T store, not an Apple store. If you're too lazy to read the whole thing, the question is in bold. Thanks everybody!