so i currently do not have an acct with at&t. Can i get a free phone at at&t, sell it, then buy and activate an iphone on the now existing line? are there any additional costs to do this than just buying an iphone and activating? is it two activation fees? but still, as long as the free phone is more valuable than the activation fee, seems to make sense. almost too easy. i gotta be missing something here...... thanks.