No Gsm Network Alarm; Check The Vehicle State - Coban GPS103-A User Manual

Quite silent mode Press "A+B" together in disarm state for 0.5 second

6.21. No GSM Network Alarm

When the car is in the place without GSM network service, siren will
alarm under non-silent mode if alarm is triggered(door, sensor, ACC), but no
SMS alarm will send to authorized number.

6.22 Check the Vehicle State.

Send SMS command "check+password" to the tracker device in the vehicle, It
will reply the status of the power, battery, GPS, ACC, door, GSM signal to the
authorized number. For example: Send SMS "check123456" to the tracker
device in the vehicle, It will reply following SMS.
Power: ON
Battery: HIGH
GPS: OK
ACC: Off
Door: Off
GSM Signal: 1-32(performance). Note: The higher digit it shows; the stronger
of GSM signals it receives.
20
again, siren will alarm four times. Siren will alarm after
alarm is triggered. And tracker will also send SMS alarm to
authorized number.