First of all, I don't think it's a problem with the card reader, because your
previous card reader can read the sim card. That means there is nothing wrong with the
card reader. Secondly, I think the problem may appear on the fpc, because the previous sim
card is a large card, and the current sim card is a small card. Are their pins adjusted?
I'm not sure about this,
According to the pin definition on the schematic diagram, combined with the pin definition
of the existing sim card, compared with the pcb of the fpc, there may be new discoveries.
I keep feeling like my fpc and phone link pins are misaligned. This is my personal
feeling, of course, the premise is that there is nothing wrong with my server
configuration. I also tried to test it with a linux. Can you tell me how you tested it?