Apple says the issue may stem from having an inactive SIM with the same number as your active SIM. To fix it, remove the inactive SIM and activate iMessage again.
Most smartphones have a tiny hole at the bottom of them but it's not always clear what it's for. Here's what that hole is for and what it does.
Experiencing no sound for text messages, keyboard, or emails after iOS 26 update? Follow expert step-by-step fixes to restore notification sounds instantly.