I don't see any icon for making phone calls and messaging on my iphone, but i still can receive call and messages. What do i need to do?

done doing this..now my iphone only displays the dock cable pointing towards the itunes logo..What happened? It won't display anything other than that.

done doing this..now my iphone only displays the dock cable pointing towards the itunes logo..What happened? It won't display anything other than that.