I have seen the setting for both TMo and AT&T in this forum in past years, I would do a search of some key words and I am sure you will pull it up pretty easily.
Note - you may only have to change the access address to get it to work ok - AT&T may have changed it (they are trying to cut back on data service access across the board). If so, you may have to scan AT&T wireless data forums for the most recent settings.
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