AT+CCID returns ERROR

The title says it all. I have a SL6087 modem here. There is supposedly an embedded SIM card connected to it (if the PCB design is allright).
Is this a problem with the hardware?

https://forum.sierrawireless.com/t/faq-forum-wiki/3491/4

Thank you awneil. Now it gave me CME ERROR 10, which means SIM not inserted. I know where to look next now :slight_smile: