Apple says the issue may stem from having an inactive SIM with the same number as your active SIM. To fix it, remove the ...

iPhone users on iOS 26, iMessage activation may be blocked by an inactive SIM — here's how to fix it. Some users are finding ...

Update: iOS 18.0.1 for iPhone resolves the issue as mentioned in the release notes. There’s an unfortunate bug in Apple’s latest software update that you should know about. The bug occurs in the ...

It's easy to enable iMessage on an iPhone to send messages over cellular data or Wi-Fi with other iPhones, or over Wi-Fi with iPads or Mac computers.

Since iOS 26 was released last month, some iPhone users have had problems using iMessage with their phone numbers.