IMessage not working for me

My boyfriend had to get a new iPhone today and when he texts me they come through as iMessages but when I text him back they go through as text messages. But when I text my mom ours go through as iMessages. Why is this

Added (1). He is recieving and sending iMessages from other people and so am I. I've turned my phone on and off and I have also turned off my iMessage

He may be in an area where imessage is unavailable. He needs to turn on SMS by going to SETTINGS>MESSAGING, then scroll down and turn it on. Also check your phone settings also.

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