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Does an upgrade to the 16GB iPhone require a contract extension?

This is really just a hypothetical question. If they require a new contract, so what? You're, at most, 7 months into your current 2 year deal, and AT&T's exclusive rights don't run out for over 4 years. If you're not going to hack your iPhone (which, if you are, means that the question is irrelevant to you), you're stuck with AT&T for another two contracts' worth, at least.
 
And yet another thread says you just pull your sim out of the old phone and put it in the new phone, and reactivate in itunes without a new contract.

That makes sense to me; that's what happens when you are given a loaner or replacement phone.
 
Do I need to sign a new contract for the 16GB iPhone? No. You can yank your SIM card from your old phone and put it in the 16GB iPhone, activate it for free through iTunes and start using it with your current contract. It’s just like replacing a broken iPhone. Even if you don’t have your old SIM card, you can activate with a new SIM card and your account information will simply be updated. ---cnet
 
It shouldn't need a contract extension. It's not like they subsidized either of the the units. I know with T-Mobile, if I upgraded to a new phone (subsidized by them) they would lengthen the contract for another two years.
 
I talked to an apple person via the online store chat and they told me that removing the SIM voids the warranty.... I told her she was mistaken because iTunes told me specifically to use the SIM from my old phone in my iphone (corporate).

just thought i'd share.
 
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