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Aug 12, 2015 7:35 AM in response to toneyfengby D.Cohen,Take a look at these articles:
https://support.apple.com/en-us/HT204408
iOS and OS X: Link your phone number and Apple ID for use with FaceTime and iMessage - Apple Support
If you get an error when trying to activate iMessage or FaceTime - Apple Support
http://www.igeeksblog.com/fix-imessage-waiting-for-activation/