Hello, I have an a iPad and like it very much. I also like various apps for iOS. I am even trying to develop one. During the development process I found a page that provided relevant information about app development for iDevices with code snippets. I made good use of the code snippets (If you are interested: http://www.voip-sip-sdk.com/p_457-voip-iphone-integration-voip.html). In my opinion it is a good place to start if someone want to develop an own app for iOS.