IMessage problems on iPhone 5?

My phone won't let me send any messages. Sometimes one or two will get through but they'll send as texts and not imessage. And the person who send a text to me, they come out as texts too but I don't always receive all of the ones that were sent. Also the hard reset doesn't work, I tried it twice

Make sure you have working internet connection.
Are you sending messages to emails or phone numbers?

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