My iPhone won't activate messages?

My software is completely up to date, and I'm using my right apple ID. I have used iMessage on my phone before but for some reason is now not letting me.
What do I do?

First check to see if you have your data turned off that is usually thenissue. SometiMes IMessage goes down I don't know why but many people in my local area lose iMessage for a couple hours all at once.

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