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 ...

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.

Are you not receiving text notifications on your iPhone 15 Pro or another iPhone model? Concerned about missing important messages? Worry not! You should be able to get things fixed in no time at all.