Upgrading iPhone 4 to iPhone 5? - 1

If I have upgraded my phone and I now have two phones with the same number does the contract I pay for work on both phones but only cost what it would be for one?

You would only have one sim card, so you could only use one phone at a time, but you could alternate, if that is what you're asking.

You could switch the SIM card (small chip that provides your phone with your account/phone number info and that slides in the side of your phone) between phones and use one phone at a time. *Except* that the iPhone 4 and iPhone 5 use different size SIM cards. (Micro SIM on 4 vs nano SIM on 5)

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