14. Pendulums inside that generate electricity from kinetic energy and recharge the phone.
15. The ability to read text messages to me when I am driving, and ability of the phone to translate my voice to text messages when I am driving.
16. An option to lock the phone in landscape/portrait mode, for any application.
17. Ability to take a picture of a document and then search it for a word.
18. Ability to double as a USB flash drive and plug into any computer. (perhaps completely separate memory from the actual phone; to prevent viruses) Why? Because you will always have a flash drive with you then.
19. All cell phone towers have thermometers and the iPhones display the current temperature.
20. Built-in AM/FM radio receiver.
I think you can already see the temperature to some extent by hacking the CPU, since if the phone gets too hot like in a hot climate then it locks down and displays a screen saying it needs to cool down, unless that was fake I don't remember...