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  1.    #1  
    Is it okay to remove the SIM card without turning off the Treo 650 phone function? I did not find such warning from the user manual.

    Where can I buy the SIM holder that plugs into the top of the Treo 650 ?
  2. #2  
    The SIM holder is a free upgrade available on the Cingular site.
  3. #3  
    A GSM treo should already have a SIM holder. And yes, you can remove the SIM while the Treo is on.
  4. #4  
    Check the 1st link from cingular support above for these instructions:

    1. Turn off the Treo 650's radio.
    2. Pull out the SIM tray.
    3. If the SIM tray looks like the OLD SIM tray noted below, a new SIM tray may be needed. Proceed with the next section.

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