How to deregister an old phone number in iMessage when you don’t have access to that old number, but still using the same iPhone?
The mobile carrier changed the old phone number to the new number without changing the SIM card.
I have done several number changes including at least one like you where the same SIM got renumbered. The new number registered automatically for me and pushed out the old number. Just follow the steps above to turn off iMessage then turn on again, but I think mine just worked when I rebooted the phone. To make it clear, You don’t need the old number to unregister it, the new number overwrites it when the phone notices it has been renumbered.
Unfortunately, that is not the case with mine.
It has only worked after I’ve changed the Apple ID password, signed out of all my devices, powered off/on, signing back in and then turning on/off iMessage in the iCloud settings.
And this is after almost a week of following every direction, instruction, suggestion by Apple, the support communities, the web and YouTube.
Now just waiting for the ‘contactable’ details to include the new number as iMessage & FaceTime number.
Have a look at this article: Deregister iMessage on your iPhone or online
Once you turn off iMessage and FaceTime, turn them back on to register your new number.Deregister iMessage on your iPhone
If you still have your iPhone, you can deregister iMessage with these steps:
- If you transferred your SIM card from your iPhone to a non-Apple phone, put it back in your iPhone.
- Make sure that you're connected to your cellular data network.
- Tap Settings > Messages and turn off iMessage.
I wish it was as simple as turning off iMessage and FaceTime.
Here is the problem; the SIM card is now registering the new number. I do not have access to the old number. It has been erased from its SIM card.
How do you deregister without access to the old number is my original post question?
Deregister old phone number in iMessage without access to that old number?
