How do I install a SIM card in the tracker?
Use the screwdriver that came with the device to open the sealed buckle and insert the SIM card. Make sure the SIM card is for a GSM network, has incoming calls display enabled, no call diversion, and the PIN code is not locked. The SMS format must be TXT format — the tracker cannot recognize PDU format.
From the official Gps Tracker 303fg 2 V3 4 Gps Locator manual, page 7
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