Edit phone number associated with device / SIM

Question

On my device, when I check the phone number through Settings > About Phone > Status > SIM Status, the phone number is incorrect. I ported my number over when I took out a new contract so I guess this is the number originally associated with the SIM. Is there any way to change this?

EDIT: Device is a Nexus 6P running M 6.0.1, no root.

Answer 1

A SIM contains multiple phonebook sections. One of them stores your SIM contacts. Another section contains "My Numbers" (MSISDN) with a max capacity of 3 numbers, usually.

Unfortunately, my phones are too new to access "My Numbers", and my phones that are old enough (2005) to edit them are out of reach.

Fortunately, I had a spare SIM800 development board lying around. I hooked it up to my Arduino and started issuing AT commands.

Here's my conversation with my SIM card:

AT               <-- Check if we are live and communicating with the SIM

OK

AT+CNUM?         <-- Get own number

ERROR            <-- CNUM failed, we don't have an "own" number

at+cpbs="ON"     <-- Switch to "ON" phonebook: MSISDN (SIM own numbers)

OK

at+cpbs?         <-- Get capacity of current phonebook

+CPBS: "ON",0,3  <-- Notice that there's no stored number (0 out of 3)

OK

at+cpbw=,"+639950001234"    <-- Saving my number

OK

at+cpbs?          <-- Get capacity of current phonebook

+CPBS: "ON",1,3   <-- Number saved (now consuming 1 out of 3 slots)

OK

at+cnum           <-- Get own number

+CNUM: ,"+639950001234",145,,4    <-- CNUM OK

OK

AT

OK

Unplugged, then returned SIM to phone. After that, my phone now shows my number +639950001234 instead of "Unknown".

Answer 2

I have found only two solutions:

1. Get Xposed and then either the app above or this one: https://forum.xda-developers.com/galaxy-s3/themes-apps/app-sim-changer-change-registered-sim-t2106490
2. Use an old Nokia/Alcatel phone to edit SIM phone number

Answer 3

Unfortunately I've had to join to answer this, so don't have the reputation to add a comment to Aloha's answer, but anyway... that answer is almost perfect. However, I was recently trying to change the my number using that method, but found that I couldn't access the "ON" phone book. It turns out that you have to switch to local phone books before you can access it ( presumably only on some modems or SIM cards. ) You do this using AT$QCPBMPREF=1 - after which the "ON" phone book is available. I found this info from the thread here.