I had bought iPhone 4 running on ios 5. Everyone knows that it has many new features like siri and all. I was exploring all features one by one. Finally I came across the iMessages I. tried to send message to my friend using iMessages but it wasnít sent at all. I tried first over 3G connections and it failed. Next time I tried using wifi connection by connecting my ipad to it. This time also the same issue. It seems like the iMessage is not at all functional. Is there any kind of activation which I need to perform on my side or the network provider side to start iMessages service on iphone 4?