The action Set Data Roaming State turns the global data roaming setting on or off.

Warning: This function requires root access, is not officially supported by Android and might not work on all devices.
Note: adb can be used on some versions of Android to grant the permissions to execute the action without root:

1. Install adb on a computer (search internet on how to install adb)
2. enable USB Debugging in System settings -> Developer options on your Android device
3. connect your Android device to the computer
4. execute following command in a terminal: adb shell pm grant ch.gridvision.ppam.androidautomagic android.permission.WRITE_SECURE_SETTINGS

• Activate data roaming abroad every morning for 10 minutes to synchronize the mails and deactivate data roaming again for the rest of the day.