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  1.    #1  
    Hi I know cingular treo 600 is sim card unlock,and how about the at&t version?
  2. #2  
    You are correct, the Cingular Treo is unlocked. You can use any SIM with it.

    The AT&T is locked. And as far as I know, they are unwilling to unlock it. T-mobile on the other hand claims to unlock when asked (but theirs isn't out yet).

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