Thanks for the reply! Whats the differnce of data/feature from iPhone to WP?
The data plans also tell ATT's systems how to support your phone. For instance visual voice mail on the iPhone is handled differently thant on a WP. It ensures you get the the value in use for the data plan you are paying for.
While you can move a SIM around to use different phones and have ATT update your data plan with each move, I find it to be more of a pain than it is worth...... You need to decide that for yourself though. You may find it to be worth it.
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Information on iPhone unlocking can be found here by copying this link into your browser: https://www.att.com/deviceunlock/client/en_US/