As far as I can see, the requirements to develop for any iOS device are: 1. Own a Mac computer that runs the latest version operating system. 2. Register with Apple to be an iOS developer for $99.00 + tax, annually. 3. Own an iOS device that runs the latest iOS operating system your application will support. For a professional iOS developer, that means the latest operating system out.
Am I wrong? If so, where? I've just bought a brand new iMac and I'm looking for a used iPhone. I want to make sure I buy one that will allow me to develop iOS in the latest version.