iMessage activation unsuccessful
whenever I try to use iMessage it says activation unsuccessful
iPhone 12 Pro Max, iOS 15
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See the Apple Support article(s) below.
Messages - If you get an error when trying to activate iMessage or FaceTime. *
If you can’t turn on or sign in to iMessage or FaceTime. *
Some things you can try. Do you have access to another WiFi network where you can try? That has worked for several people.
Try a restart.
Restart your iPhone, iPad, or iPod touch *
Try a forced restart.
Reset Device. -
If necessary
Hard reset. -
Do a backup and try a factory reset. Then restore from your backup.
Restore - If you see an error when you update or restore your iPhone, iPad, or iPod. *
Backup - Restore your device from an iCloud or iTunes backup. *