Back to the question asked by the OP.
The Storm 9550, if unlocked, will work on ATT.
If you follow the Sticky, you will be fine.
And, if questions come up, come back to this forum for the answers.
Good Luck!
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Blackberry Storm2 (Verizon)
7280-7780-7290-7100g-7250-8703-8830-8330-9530-9550
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