What will happen if i change my sim from my iphone 3gs to a atrix 2?

I have an iphone 3gs from At&t, i'm going to buy a atrix 2 on ebay. If i swap the swim from my iphone to the atrix 2 will there be any kind of fees? Do i have to change my data plan?

No.

The more important thing would be if the Atrix 2 would be able to accept the SIM whether it be an AT&T phone as well or unlocked

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