Everyday my number I use for my IMessage and Facetime messes up and today now it’s saying activation error but my iCloud and other things work. I restarted my phone multiple times before and it only helped for a few days then keeps doing the same thing
See if anything here helps.
Messages - If you get an error when trying to activate 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.
If necessary
Do a backup and try a factory reset. Then restore from your backup.
Backup - Restore your device from an iCloud or iTunes backup.
Activation Error
