How do I know if my SIM card works or not?

Follow the quick start guide to set up your Pawfit tracker. Around 30 seconds after power up, press the power button, if the LED flashes blue then it means your SIM card works. If the LED flashes red it means that your tracker is not connected to a 2G phone network. Wait for a couple of minutes and press the power button again, if the LED still flashes red then follow the answer to the next question for a fix.