I've recently just got the iPhone 5, I also have the ipad 3. When I have tried to iMessage a friend who I know has an iPhone and have imessaged on my old iPhone 4S, when I get a reply the reply is only showing on my ipad when I would like it to be on iPhone. I have gone through settings on both devices and it still won't work. It is sending any message as SMS not iMessage. It's really frustrating.