On your iPhone:
https://support.apple.com/en-us/HT201349
On your iPhone: Go to Settings > Messages and make sure that iMessage is on. You might need to wait a moment for it to activate. Tap Send & Receive. If you see “Use your Apple ID for iMessage,” tap it and sign in with the same Apple ID that you use on your Mac, iPad, ... In the "You can receive iMessages" section, make sure that your phone number and Apple ID are selected. Go to Settings > FaceTime and make sure that your phone number and Apple ID are selected in the "You can be reached by FaceTime at" section.
Go to Settings > Messages and make sure that iMessage is on. You might need to wait a moment for it to activate.
Tap Send & Receive. If you see “Use your Apple ID for iMessage,” tap it and sign in with the same Apple ID that you use on your Mac, iPad, ...
In the "You can receive iMessages" section, make sure that your phone number and Apple ID are selected.
Go to Settings > FaceTime and make sure that your phone number and Apple ID are selected in the "You can be reached by FaceTime at" section.
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