for my project I’m using the EC21-E (Revision EC21EFAR02A09M4G) and I want to read the preferred operator list stored on the SIM Card.
Unfortunately “AT+CPOL?” gives me “+CME ERROR: operation not allowed” in response permanently.
I used the operator list on the SIM with another modem before, so it is stored and accessible.
I wonder if i missed some requirements for the EC21 before executing AT+CPOL?.
Has anyone had this kind of issue and can tell my why it fails?