Samsung YP-G50CW User Manual page 22

Use basic functions >
Tapping
To select a menu or option, tap the screen once with your finger.
Use the touch screen
Spreading and Pinching
To zoom in on photos, web pages, and maps, tap the touch
screen with two fingers and then spread your fingers apart. To
zoom out, tap the touch screen with two fingers and then pinch
them together.
You can also zoom in or out by double-tapping an area.
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