Log into the STAGTELEMATIC application. Select the vehicles tab. Find and select the vehicle which module you would like to disable. Click the Settings button and select the "Pairing" tab. Press the "UNPAIR" button and wait till the process is completed. Module state should say the module is "UNPAIRED". Unpair the GSM module using the application.
Make sure you have unpaired the module in the application and you can remove the module without locking the GAS module and preventing the vehicle from being able to drive on GAS. Remove the module from the vehicle by unplugging it from the installation.
Once unplugged from the installation you can open the GSM module. Pull the SIM card from the device. This will ensure that the GSM module won't send any data using the internal battery.