If I understand correctly, you want to retrieve the phone number associated with the SIM card, is that correct?
In this case, the number is not stored in the SIM card by default, nor the phone or router the card is inserted in.
In your case, you will first need to add your phone to the SIM card's phonebook, with the command similar to this:
- gsmctl -A 'AT+CPBW=1,"860700000",129,"test"'
Where the first member after "=" is index number of the phonebook, number within quotations is the phone number, it is followed by the type of the number and the last string is the name, associated with the number. For more details about the command refer to modem's AT commands manual here.
Once the number is saved, you will be able to retrieve it with the following command:
To get your number in the first place, you can simply send an SMS from the router to a specified phone number by using Services -> Events reporting feature to send test SMS.
Best regards,