imessage
imassege not working on iphone
on ipad it is working
iPhone 5s, iOS 12
What happens when you try to use Messages on the phone? Error message(s)? More information would help.
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.
