Siri is a new feature available on the iPhone 4S. I find myself asking others how to spell unfamiliar often. When no one is around I have to find a different word to use. If you are like me Siri can be very helpful. Simply ask Siri "how do you spell..." and Siri will give you the correct spelling in seconds. Siri has many other useful functions such as defining words. To learn more about the iPhone 4S and its accessibility features click here.