Samsung SGH-M919 User Manual T-mobile Sgh-m919 Galaxy S4 English User Manual V - Page 37

3. micro SIM Card Slot (internal) Installation location for SIM card. 2 1 Side Views The following illustration shows the side elements of your device: 7 1 2 6 5 34 4. Flash is used to take photos in low-light conditions. 5. Headset jack allows you to connect a hands-free headset so you can listen to music. 6. Camera lens is used to take photos. 7. IR Transmitter used to emit infrared signals used for controlling external devices. For more information, refer to "Using WatchON" on page 176. 1. Volume key allows you to adjust the ringer volume in standby mode (with the phone open) or adjust the voice volume during a call. When receiving an incoming call: • Pressing the volume key down mutes the ring tone. 2. Power/End key ends a call or switches the phone off and on. Press and hold for two seconds to turn toggle the Silent mode or Airplane mode states, turn the device on or off, or Restart. Understanding Your Device 31