My imessage is not working, why?

So I tried to text my friend (we both have iPhones) and I have the iphone5, but when I type an imessage and hit send it doesn't work. Like I'll send an imessage and it will go through as blue but on the bottom won't say delivered. And if I hold down and press the imessage it will give me an option saying "send as text message". And also when I facetime audio them it will say "not avalible for FaceTime". Or "FaceTime failed". And when I call them it will ring ONCE then go straight to voicemail. And this is only for one person. With everyone else, imessage and FaceTime and calls work. And they have a good connection and so do I. And my imessage is on. I don't know what else to do.

Sounds like a carrier issue

Sound's like your friend's phone is having the problems.

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