Though we don't know the scope of the users affected, we do know who might be affected. According to Apple, the issue might occur when updating to iOS 26 if you have an inactive SIM with the same ...
Since iOS 26 was released last month, some iPhone users have had problems using iMessage with their phone numbers.
If you're having trouble getting iMessage to work after upgrading to iOS 26, Apple is aware of the issue and has shared a fix ...
OS 26 users are reporting iMessage activation issues caused by inactive SIM conflicts. Learn why this happens and how to fix ...