What is TTY?

[mcaram16]

Can someone please tell me what TTY is??

[Youngbinks]

This should give you a pretty good idea. http://en.wikipedia.org/wiki/TTY

[mcaram16]

well whats the point of it on the iphone?

[Youngbinks]

Well, I think you can use some extra equipment to set it up so that a deaf person (or any bit of hearing impairment) could use the phone as a communication device.

[jagxk]

TTY allows hearing impaired individuals to make and receive text phone calls.