To show correspondence for M.2/Mini PCIE/SIM sockets and LTE/WiFi modules on FWA-1212VC.
From the picture bellow, we can see there are 1 *M.2 2230, 1 *M.2 3042/3052 and 1* Mini
M.2 2230: supports WiFi modules
M.2 3042/3052: supports LTE/5G modules
Mini PCIE: supports WiFi/LTE/SSD
Also you can see there are two SIM sockets from the front side of panel.
SIM1 socket is for M.2 3042/3052 LTE/5G module, while SIM2 socket is for Mini PCIE LTE module.
Be careful to insert SIM cards into the correct slots.