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sim: try "ON" phonebook entry #1 if AT+CNUM fails

Submitted by Aleksander Morgado

Assigned to ModemManager bug user

Link to original bug (#85049)

Description

Originally reported at: https://bugzilla.gnome.org/show_bug.cgi?id=696693

Some devices always reply with ERROR to AT+CNUM, but switching to the own-numbers (ON) phonebook and checking entry #1 (closed) shows the correct number.

at+cnum? ERROR at+cpbs="ON" OK at+cpbr=1 +CPBR: 1,"16121234567",129,"004D0073006900730064006E0031" OK

Yes, the modem is in UCS-2 character set and the UCS-2 string spells "Msisdn1". If other SIMs have "Msisdn1" here too, maybe we could use that as a check.

Another possibility would be to directly read from a SIM file through +CRSM.

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