You can use Voice Control (available only on iPhone 3GS) to control music playback on iPhone.
NOTE: Voice Control isn’t available in all languages.
Press and hold the Home
button until the Voice Control screen appears and you hear a beep. Then use the commands described below to play songs.
You can also press and hold the center button on the iPhone headset (or the equivalent button on your Bluetooth headset) to bring up Voice Control.
Say “play” or “play music.” To pause, say “pause” or “pause music.” You can also say “next song” or “previous song.”
Say “play,” then say “album,” “artist,” or “playlist” and the name.
Say “shuffle.”
Say “what’s playing,” “what song is this,” “who sings this song,” or “who is this song by.”
Say “Genius,” “play more like this,” or “play more songs like this.”
Say “cancel” or “stop.”