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  1.    #1  
    My Phone cannot be used with this SIM Card? Cingular Treo 650 and I'm using my Cingular SIM card out of my V3 Razr. What can I do to fix???
  2. #2  
    <split, the other thread is for Treo 600>
    Welcome aboard to TreoCentral!

    No reason why you should have a problem with your SIM. Since you are with Cingular, and you are using a Cingular Treo, did you try to call them first?

    Were you were originally an AT&T account?

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