Starting a new At&t contract and upgrades?

Right now I'm under my parents att account, but me and my wife want to open our own account. I know when you open a new account you can buy subsidized phones. Now my wife and I already have iPhone 5s - we don't need new phones. So if we start a new account with att, when will our next upgrade be? Will it be in two years? Or will we be eligible to upgrade whenever we want since we didn't buy new phones when we open our account?

If you keep your same numbers, you in turn keep the same contract length.So, you also keep your same upgrade eligibility. You will be eligible 24 months from when you got your 5s. This keeps your parents from being charged a cancellation fee.

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