Hi,
I fount two sim slots on the Portentia Max Carrier. The one is at the back the other is on the front. The front seems to be where the NB-IoT cell sim will be placed.
What is the second sim slot at the back for?
Hi @flowgrow ,
The first SIM card slot on the top side of the board is for the Cellular Modem.
The second, placed on the back of the board, relates to the Mini PCIe card slot. You can take a look at the Portenta Max Carrier Architecture Overview shown in the User Manual here: https://docs.arduino.cc/tutorials/portenta-max-carrier/user-manual/#carrier-architecture-overview
Best,