Samsung Galaxy S III User Manual page 126

Using Google Voice Typing
1. From a screen where you can enter text, in a single motion,
touch and drag the Status bar down to the bottom of the
screen, then select
voice typing. The virtual keyboard is then removed and all
subsequent input to done via the microphone as text to
speech.
2. Speak into the device's microphone and watch your text being
entered on-screen.
3. If the text is incorrect, tap DELETE.
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(Choose input method) Google