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2g gps tracker needs to install the basic principle of SIM traffic card | #gps tracker

2g gps tracker needs to install the basic principle of SIM traffic card

2g gps tracker needs to install the basic principle of SIM traffic card

Anyone who has used 2g gps tracker knows that in order to use the device normally, a SIM card must be configured in the device, and the card is activated and can be used normally. Why does the 2g gps tracker have to be equipped with a SIM card to track the vehicle? It is not difficult to u