The AT&T version of the iPad 2 is unlocked. This means you can use the iPad 2 with any US or International GSM carrier. AT&T isn't the only GSM carrier in the US, there is also T-Mobile and several small other carriers.
IMO the only difference between using AT&T and T-Mobile would be that the AT&T plan is pay as you go. I don't know if T-Mobile would offer the same plan.
I do not believe the Verizon version is unlocked.
--Gijzette
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