GPS Tracker 303 B stopped sending alarm message

MohamadEl-Wakeel

I have GPS Tracker 303 installed in my car & everything was working normally for like 8 years.

but now the tracker stopped sending the alarm sms message & also when I call or ring to the number
it does not sending the location sms message,
although the tracker is responding well to every command I send in sms

so is it problem in the device or in the sim card?

by the way i changed the built in battery (3.7v) a couple days ago, but this replacement has nothing to do with
my issue.

kuta

MohamadEl-Wakeel
Based on the symptoms you’ve described, this appears to be more likely a configuration issue rather than a hardware problem, since the device is still responding to SMS commands. Here are the recommended steps to resolve this:

Check the SMS Center Number configuration in your device:

This number might have changed if your mobile operator made any updates
You can get the correct SMS center number from your mobile operator

Verify with your mobile operator:

Confirm that SMS services are still active on the SIM card
Check if there have been any changes to the network settings
Verify if any service restrictions have been applied to the SIM

Try reconfiguring the alarm and callback settings:

Reset the alarm configuration using SMS commands
Reconfigure the callback feature
Since the device responds to commands, this suggests that both the device and SIM card are functioning at a basic level, and the issue is likely related to specific SMS feature settings.

Useful links:

Why GPS trackers may not work