Monthly iPhone costs for AT&T?

Does the price per month change when you upgrade to a new iphone model? Like if i upgrade from a 3GS to a 5, aside from the cost of the phone would the price per month change or not?

Most allow you to stay on your same plan.

Some people have the 3gs but have no data on there plan which used to be allowed

now though you have to have data

if you already have internet data than you will pay the same

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