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Old 12-31-2009, 01:58 PM   #8 (permalink)
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Join Date: Dec 2009
Model: 8900
Carrier: AT&T
Posts: 90
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As stated, TMO SIM can work on unlocked AT&T device.

You will need to login to your TMO BIS account, register the AT&T BB device (you'll need to provide PIN and IMEI) then send Service Books.

If you're used to UMA calling on your drowned TMO 8320, the AT&T device does not have UMA function.
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