My iPhone won't let me use my number for iMessage?

I just a got an iPhone today and I absolutely love it.however, my iMessage won't let me use my number for iMessage but only my email. How do can I use my number for iMessage.

See the help article

https://discussions.apple.com/...0&tstart=0

Pretty easy to follow. If stuck, get a friend who can help with iphone

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