Turn off iMessage
Wait for about a minute and then Turn on back iMessage
It will re-activate your iMessage, using the new number.
Updating the Phone Number Displayed in FaceTime
To update the phone number used and displayed by FaceTime:
Tap on Settings | FaceTime
Turn off the FaceTime and wait for about a minute
Turn on back the FaceTime
It will re-activate the new number for FaceTime.
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