New iPhone and iPod touch owners, did you know that holding down the Home button for three seconds at any time – including when the screen is off – activates your device’s Voice Control mode? Wait for the beep, then say “Play songs by The Beatles.” Your iPod or iPhone will recognize your voice and say, “Playing songs by The Beatles,” then start playback.
This works on the iPhone 3GS, iPhone 4, iPod touch 3G (using microphone headset), and iPod touch 4G, and is extremely handy in a car.
Additionally, iPhone users can hold down the Home Button for three seconds, wait for the beep, and say “Call [Person’s Name] – Home” or “Call [Person’s Name] – Work.” The iPhone will automatically recognize your voice and the name, then call the person based on the type of phone number you specify.
Voice Control lets you speak phone numbers, too: “Dial 716-123-4567.” It’s pretty accurate, so long as you remember to say the initial command.