Samsung SM-A546W User Manual page 7

Getting started
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,
•
unwanted noises may occur during calls or media playback.
Do not cover the light sensor area with accessories, such as stickers or a cover.
•
Doing so may cause the sensor to malfunction.
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