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  1.    #1  
    On GSM devices, SMS messages are delivered via signalling channels, and can arrive even if you're on a voice call or are using GPRS data.

    Is this also the case on CDMA2000 1xRTT devices like the Treo 300, or can SMS messages only arrive while you have neither a voice nor a data connection active?
  2. #2  
    Yes, SMS messages can arrive while either voice or data is in use.

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