How to achieve 4G internet access for models with built-in SIM card slots on the motherboard?

(How to achieve 4G Internet access for a model with a SIM card slot on the motherboard?)

 

Overview: Models with SIM card slots, through the expansion of 4G module +SIM card can achieve 4G Internet access in places without wired network and WIFI, of course, the premise is that the use of the scene has 4G network coverage.

 

PS: If the 4G module is not installed, the SIM card cannot be identified by directly inserting the SIM card into the mainboard, and the 4G module is required for identification. The 4G module is an optional component and is not available by factory default. Before purchasing the product, you can contact customer service to purchase, you can also buy the 4G module expansion, note: when purchasing the 4G module, please confirm whether the 4G module meets the network standards of your local network operator, for details, please consult the 4G module dealer or network operator.

 

1. 4G module hardware Installation (taking P12B as an example)
1-1. Remove the bottom 6 screws and open the bottom shell