iMessage - unable to send messages

[Actionmarek]

I noticed one day when I turned my iPad 2 that I was no longer able to send messages
What do I need to do to get back this great built in App?

 

[J. A.]

Make sure that iMessage is enabled in Settings - Messages, and that it shows your Apple ID.

Try the usual fixes:
Restart your iPad - turn it off, wait for a few minutes, then on again.
Reset your device: press and hold Home and Power button until the Apple logo appears, then release both and let the iPad start on it's own.

If this doesn't fix your issue, try another kind of reset: Go to Settings - General - Reset - Reset all Settings. You won't lose data by performing this reset. What you have to do afterwards, is set up all the settings again.

 

[Ser Aphim]

Also note that it won't work on contacts that has no iMessage set up. It will not also work when you are not connected to wifi or cellular data.