We were talking with iMessage and then one message I sent went through as a text message and since then iMessage has continued to not work and we have been talking through text message. I can communicate with other people through iMessage and so can the other person. It's just not working with eachother. I have tried turning my iphone off and then back on, I have tried turning iMessage off and then back off. Nothing is working. Does anyone know why this happening or how to fix it?