Hello,
Could you specify the uci commands you have used to configure the router?
Does the modem respond under default configuration?
The issue seems to rise from SIM switch configuration. For some reason the device fails reading configuration details. Have you made any changes to this functionality with uci?
At the moment, logs indicate SIM PIN requirement. Since Network -> Mobile -> General is not accessible over WebUI, could you login via SSH and enter this value?
Best regards,