Unable to use iMessage on my iPhone

Here is what Apple suggests doing: If you can't send or receive messages on your iPhone or iPad - Apple Support

Also test Messages with a Wi-Fi connection, and also check with your mobile operator.

"Unable to use iMessage on my iPhone"

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Troubleshooting iMessage:

A. See if this Pertains to Messages App:

You are using iMessages here --not Messages. So, does this occur in just the iMessages app? Or is this occurring in the Messages app, as well? The continuously-rotating circle indicated it is in a loop, because it is having issues resigning text messages from iCloud.

B. Reenable iMessages on your iPhone:

See Here: Set Up iCloud for Messages on All your Devices - Apple Support. As it Reads: "Note: If you want to turn off Messages in iCloud on your Mac, deselect Enable Messages in iCloud. You can choose to disable Messages in iCloud for all your devices, or just your Mac."

1. Go to: Settings
2. Tap: [your name] (top item)
3. Tap: iCloud
4. Tap: Messages
5. Toggle Off: Use on this iPhone
6. Toggle On: Use on this iPhone

Also...

C. Try a Force Restart:

Go Here: Force Restart iPhone - Apple Support

B. Checking Apple's System Status:

For the record, Apple has no reports of current or recent iMessage app issues.

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