iMessage Not Working? Here's How to …
https://www.iphonelife.com/content/imessage-not-working-try-these-troubleshooting-tips-to-fix-it
Open Settings and tap Messages. Select Send & Receive. Choose where you can be reached at with iMessage. If your iMessage problem is that it’s grey-out, delect your emails, redo step two, and return to make sure your number is checked. You should also be able to reselect your email, if desired. If your outgoing messages on iPhone appear as green bubbles, it means iMessage isn't working and they've been sent over SMS instead of iMessage. You can try toggling iMessage off and on again in your settings, or log out of your Apple ID and log back in.
Open Settings and tap Messages.
Select Send & Receive.
Choose where you can be reached at with iMessage.
If your iMessage problem is that it’s grey-out, delect your emails, redo step two, and return to make sure your number is checked. You should also be able to reselect your email, if desired.
If your outgoing messages on iPhone appear as green bubbles, it means iMessage isn't working and they've been sent over SMS instead of iMessage. You can try toggling iMessage off and on again in your settings, or log out of your Apple ID and log back in.
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