I have purchased a GL-M2 dev card in order to connect it to a GL-MT3000 router, and I have a problem.. I always get a "sim not registered". I tested the sim in a TP-Link 4g Router and it works perfectly. I tried with other sim from other company and the result is the same.
I am updated to 4.7.4 firmware version, I have the right APN, the right PIN, the right autentication mode but I always get the same response. ¿Any clue?
In addition, could you run this AT command and post the command output with us: AT+CSQ;+CPIN?;+COPS?;+QCFG="USBNET";+QCFG="data_interface";+QENG="servingcell"