Can I place regular voice calls with Matrix Portable on GSM?
Yes, once this option is manually enabled. Power down the unit and reboot it with the GSM module removed. Then, enter the hidden menu by pressing HANG UP three times. Select “4” for MORE, and “5” for more. Choose “4” for GSMVoice, and select “1” for Enable. Press CANCEL until you are at the Main Status Display. Now, when you boot up, with the GSM module installed, the menu will include “Dial Voice”, allowing you to use the Matrix as a mobile phone with convenient microphones and headsets, even if you do not have circuit-switched data available.