Apple iPhone iOS 5.1 - Manual (Page 157)

Large phone keypad
Make phone calls simply by tapping entries in your contacts and favorites lists. When you need to
dial a number, iPhone’s large numeric keypad makes it easy. See “Phone calls” on page 56.
Voice Control
Voice Control lets you make phone calls and control Music playback using voice commands. See
“Voice dialing” on page 57, and “Using Siri or Voice Control with Music” on page 78.
Closed captioning
Turn on closed captioning for videos: Go to Settings > Video > Closed Captioning.
Not all video content includes closed captions.
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