Samsung Galaxy S4 User Manual page 36

3. micro SIM Card Slot (internal) Installation location for SIM card.
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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 "WatchON" on
page 280.
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