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No dial tone
First check the LED lights on GPS-303. If GPS-303 is
Receiving power , no dial tone means there is no GSM.
1- Check if the sim card you are using is active.
2- Test the sim card in a mobile phone and see if the
network you are using does not have any reception
issues in your area.
No response to
Text commands
First ensure there is dial tone when you call GPS-303’s
Sim number. If there is a dial tone, there are two possible
causes for GPS-303 not to respond to your commands;
1- There is no balance/credit in the sim card you are using.
2- You are using a wrong password (default:123456)
No location report
SMS after calling
GPS-303
1- If there is an authorized phone number registered,
GPS-303 will only respond to authorized phone numbers
with SMS location reports.
2- Ensure that you are not calling from a witheld or
private phone number.