How do I fix iMessage not sending messages when it shows as enabled on iPhone?

"How do I fix iMessage not sending messages when it shows as enabled on iPhone?: I am trying to send a person a text message and it tells me it cannot send because iMessage is not enabled. When I go to settings>app>messages it shows as on"

-------

Troubleshooting iMessage:

A. Toggle On "Messages" on Other Devices:

On what device are your sending these from? If not your iPhone, then enable Messages in iCloud Settings on this device.

B. Contact your Carrier:

If nothing else works, you need to contact your Carrier, as they provide you with the service of Messaging.

C. Try the Following Links:

• Restart your iPhone - Apple Support

• If you can't Send or Receive Messages on your iPhone, iPad, or iPod touch - Apple Support

• If you can’t Turn On or Sign In to iMessage or FaceTime - Apple Support

"How do I fix iMessage not sending messages when it shows as enabled on iPhone?: I am trying to send a person a text message and it tells me it cannot send because iMessage is not enabled. When I go to settings>app>messages it shows as on"

-------

Troubleshooting iMessage:

Tried this Link?: Set up Messages on iPhone - Apple Support