The master phone does not receive the “Restart” message

The message is normally sent whenever the unit is repowered to PH1. If it is not received: Ensure that the master phone PH1 has been programmed by sending the Phones command from the master phone to the unit Ensure that the sim is correctly inserted and that the sim contacts are clean and clear. Check that there is sufficient account balance or credit in the SIM if a prepay SIM is being used. If necessary, check by putting the SIM in a phone and sending a phone-to-phone SMS message. Check that the SIM is registering on the network. Check that the correct power supply and voltages are present to power up the device. The heartbeat status indication should be flashing on the status LED. If not then check the fuse.