This means that your mobile device is not registered in the cellular network.

Make sure that you are within the coverage range/at the area supported by MTX Connect. You can find the complete MTX Connect coverage map here.
Make sure you are using an unlocked GSM mobile device (2G / 3G / 4G).
Completely turn off and then turn on your device following the device’s instructions.
Make sure that your mobile device is set to automatically connect to the cellular network; If the network connection is set to the ‘manual mode’, switch to the into automatic mode.
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