To check the state of the GPS tracker, send the SMS with the text “888” to the
SIM card number you put in the GPS tracker and you’ll get a reply with the
information about the GPS tracker’s battery capacity, signal strength, frequency
startup, memory card capacity, etc.
To restart the GPS tracker, send the SMS with the text “999” to the SIM card
number you put in the GPS tracker. It’ll take about 1 minute for the GPS tracker to
fully restarts. If you want to shut down the GPS tracker, send an SMS with the text
“444”.