How to Use the AT command to query the mobile phone number of the local machine at + cnum

The user did not write the local number into the SIM card.
Once you write your local phone number into your SIM card, you can use at + cnum to find the number of your mobile phone number.

Action command returns the msisdns related to the subscriber (this information can be stored in the sim or in
Me). If subscriber has different msisdn for different services, each msisdn is returned in a separate line.

Msisdn buffer format (see GSM 11.11 subclause10.3.5 ):
Bytes description length (bytes)
0-x Alpha identifier x
X + 1 Length of BCD Number 1
X + 2 ton and NPI 1
X + 3--x + 12 dialling Number 10
X + 13 capability/configuration identifier 1
X + 14 extension1 record identifier 1

The SIM card of a common user must first write the number of the local computer into the SIM card to read it. Otherwise, the SIM card is empty.

You can try a sim that has not been written into the local phone number. Check the phone number on your mobile phone. If you add the phone number to the SIM card, generally, a mobile phone can add a local phone number to view the interface of the local phone number). You can not only view the local phone number on the mobile phone number that you add the local phone number, in addition, you can insert this SIM card to another mobile phone to view the local phone number.


After writing the local number into the SIM card, you can use at + cnum to read the local number.