I am giving my iPhone 3GS to my brother-in-law. He currently is an AT&T customer, but is not eligible for an upgrade yet. We know that he will have to add the iPhone data plan to his account. My question is, will he need to call AT&T directly to do that, or can he put his sim card in the phone, add the data plan online and then sync the phone to iTunes? Or does he just put the sim card in, sync it to itunes and let AT&T add the data plan for him?
He won't be able to add an iphone data plan on-line until the on-line system shows that his device is an iphone. I believe that happens automatically at some point after he puts his sim card in the iphone but may not happen right away. It could take hours to days for the system to update on it's own. The quickest way is to call and give them the IMEI of the iphone and have them add the data plan.
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