CME Error: SIM failure


I’m working with a Telit LE910C4-NF and an AT&T SIM. FW release: 25.21.660.

When I run: AT+COPS=0, I get the following: +CME ERROR: SIM failure.

The SIM works fine in mobile phones and a standalone Netgear LTE modem. The following commands work fine as well:

AT+COPS=? does a search and finds a few network options as expected (t-mobile, att, verizon). RSSI is 27.

Any ideas why it doesn’t like my SIM?

Hi @jaguar1878 ,

Could you share an image of your HAT without SIM inserted on it?

The SIM is a nano SIM in an adapter to make it micro SIM sized.