Hello, SausageFingers.
The number reported by the SIM is usually the number that was on the SIM at the point of getting it. When you're in settings, that's what you'll see. It used to be that you could update it, but Android lost this option quite a long time ago.
I think the reason the number can no longer be updated on Android phones is because the operating system no longer relies on the number reported by the SIM for applications. For example, the messages application on android has it's own phone number entry section where you can tell the app your actual current phone number.
Most apps use Google Play Services for recognising your number on Android phones now. If you head into the settings on your phone, and down to Google, then hit "Manage your Google Account", then go into the "Personal Info" tab, you'll see an option further down for phone number. If you go into this, you'll see a list of verified phone numbers, and you should either see the temporary number, the new number, or both in the list. If you see both, remove the temporary number. Then ensure the correct number that's left is showing as verified. If you only have 1 number showing in the list, and it's not the right number, open it and amend it so that it is the correct number. Google Play Services will then attempt to verify the number for you.
This won't change the number showing in settings, but it will ensure that if you're in apps that are using Google Play Services, you can have them auto populate the correct phone number for you when supported.
Pete.
