Can you switch data plans between two iPhones on AT&T?

I'm on the same contract as my mom and her data plan is 2000 MBs a month and mine is 300 MBs a month. We would like to switch them so I'd get the 2 GBs. Can you do that on AT&T?

Added (1). So she would get the 300MB and i'd get the 2000MB.

But you obviously have pay higher bill.

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