Samsung SM-S921W User Manual page 11

Getting started
When using the speakers, such as when playing media files or using the
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speakerphone, do not place the device close to your ears.
Be careful not to expose the camera lens to a strong light source, such as direct
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sunlight. If the camera lens is exposed to a strong light source, the camera
image sensor may be damaged. A damaged image sensor is irreparable and will
cause dots or spots in pictures.
If you use the device with its glass or acrylic body broken, there may be a risk
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of injury. Use the device only after it has been repaired at a Samsung Service
Centre or an authorized service centre.
If dust or foreign materials enter the microphone, speaker, or receiver, or if these
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parts are covered, the device's sound may become quiet or certain features may
not work. If you attempt to remove the dust or foreign materials with a sharp
object, the device may be damaged and its appearance may be affected.
Connectivity problems and battery drain may occur in the following situations:
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‒ If you attach metallic stickers on the antenna area of the device
‒ If you attach a device cover made with metallic material to the device
‒ If you cover the device's antenna area with your hands or other objects while
using certain features, such as calls or the mobile data connection
If the air vent hole is covered by an accessory, such as a protective film or sticker,
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unwanted noises may occur during calls or media playback.
Do not cover the proximity/light sensor area with accessories, such as stickers or
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a cover. Doing so may cause the sensor to malfunction.
The light may flicker at the top of the device during calls because of proximity
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sensor operation.
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