Samsung SCH-I535RWBVZW - Manual (Page 24)

Understanding Your Phone 18
Side Views •
Volume Key : From the Home screen, press to adjust master
volume. During calls or media playback, press to adjust volume.
Press to mute the ringtone of an incoming call.
•
Power/Lock Key : Press and hold to turn the phone on or off, and
to access a device options menu. Press to lock the phone, or to
wake the screen for unlocking.