How do I activate my iMessage?
My iMessage keeps deactivating and I can not recover it?
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If you can’t turn on or sign in to iMessage or FaceTime, read this support article --> If you can’t turn on or sign in to iMessage or FaceTime on your iPhone - Apple Support
Also try restarting your device. That cleared up an activation issue we had, and it doesn't hurt to try.
If it still isn't working after a day, contact Apple --> Contact - Official Apple Support