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

Imessage only works with iphone's. You have to go into settings and turn on imessage… Also if you're not in a mobile reception area imessage will not work, and will go through the normal msg service

  • Why is my iPhone 5 imessage not working all of a sudden? This has never happened before. It was working fine all day up until about an hour or so ago. I tried restarting and all of the "fixes" but nothing worked… Help!
  • My iMessage is not working on my Iphone 4 I got the iPhone 4 around 3weeks ago.iMessage was working just fine until today. My texts were not sending at all. I have no idea how to fix this. I tried restarting my phone and resetting it and it didn't help. Someone please help! Thank you! I have tried everything! It is working on my friend's phone though so why not mine?
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