Ok I don't know exactly how I got this to work but I have a theory. Now I have a iPhone 4 and OG iPad both with ios5. At first I couldn't get iMessage to work just right. All conversations on my phone wouldn't resume or carry over to the iPad. I think how I got it to finally work is to delet my conversations that I had with other iPhone owners I know. When I did that all of a sudden my conversations were pushed to my phone and the iPad. Again, not sure exactly if that's how I got it to work, but I wanted to share this with anyone having problems.