How to change SIM card of Concox GPS Lock

How to change SIM card of Concox GPS Lock

1)  remove the rear cover first 


2) Loosen these 3 screws 


3) loosen all screws outside the box


4)  Open the plastic box


5) Loosen the small screws on the PCBA


6) Change the SIM card carefully. Do not hurt the antenna. 








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