To expand, some GPS locators may have built-in alarm function. When the SIM card is unplugged or unable to connect to the network, it may sound or send an alarm message to remind the user. This can increase the security and anti-theft function of GPS locator.
It is worth noting that different brands and models of GPS locators may have different designs and functions, and the specific use skills need to be consulted in the product manual or the manufacturer.