Hi there
If it still not work after use other working SIM card, we advise you check the module status. Please confirm whether you have changed the parameters of the module. You can follow the following AT command to check whether the parameters of the module are different from the modules that are normally registered on the network.
AT+CFUN? //Check the status of CFUN, 1 is normal, 0/4 is flight mode, 5 is factory mode or CEFS erasure, 7 is version mismatch or PA abnormal
AT+CPIN? //Check the status of the SIM card
AT+CGREG? //Check the registration status of the PS domain
AT+CREG? //Check the registration status of the CS domain
AT+QENG=“servingcell” //Check whether the module resides on the network
AT+COPS? //Check whether manual search for PLMN has been configured
AT+QCFG=“band” //Check whether the BAND configuration of the module has been modified
AT+QCFG=“nwscanmode” //Check whether the network search mode of the module has been modified
AT+QCFG=“nwscanmodeex” //Check whether the network search mode of the module has been modified
AT+QMBNCFG=“List” //Check if MBN activation does not match
AT+CGDCONT? //Check if the APN configuration is correct
If the parameters are the same but the network still cannot be registered, you can grab the abnormal log and send it to support@quectel.com
thank you