iPhone 6 iMessage suddenly not working!!

Not sure why, but recently my iMessages to any one on an iPhone have not been working. Instead of blue, the message bubbles are green.

It's telling me to turn on cellular data (which is already on) or wifi. The switch for iMessage keeps prompting that error and reverts back to being off.

I did power down and reboot, but still not working.

Any ideas for a solution?

Attached Images

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