User blogs

I talked to some customers during consultation, and many customers reported that they did not know why GPS for car tracking hidden uses SIM cards, and every GPS device produced by the company needs to install a mobile phone SIM card? So what does the SIM card do? This problem starts from the principle of GPS: GPS for car tracking hidden obtains satellite signals to calculate latitude and longitude, and then transmits it to the server through the SIM card network. The server parses the specific information and presents it on... more