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  1.    #1  
    I just bought a Treo 600 off of EBay. I have Cingular, so I took my SIM card out of my Cingular and put it into my Treo 600.

    I ran the 1.17 update - but it still says Invalid SIM. Any ideas of what I could do?
  2. #2  
    Go over to the forums at and you should be able to find what you're looking for to unlock your phone
    Palm III > HS Visor > Treo 600 > Treo 650 > Treo 750 > Treo Pro > PrePlus GSM

    "95% of all software issues are due to USER ERROR."
  3. #3  
    Go Here and request the unlock file.

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