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  1.    #1  
    I have a very good condition TREO 650 on the at&t network and it is not accepting a at&t sim card. The sim card we are using is from a treo just like the one not accepting the sim. We did a master reset and it still has problem. Anyone now what i can do if anything. Thank you.
  2. #2  
    What exact does the message says when you put the SIM card in? You may have one of those SIM tray cards that needs to be ribbed for support and reliable connection.

    Treo 650 GSM's are either Cingular branded or non-branded ones. Your AT&T SIM should work unless possibly it is one of the old AT&T Blue network SIM card where prior users reports problems.

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