Samsung SM-A205G/DS, Руководство пользователя

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Basics
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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
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If you attach a device cover made with metallic material to the device
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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
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Using a Samsung-approved screen protector is recommended. Unapproved screen
protectors may cause the sensors to malfunction.
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Do not cover the proximity sensor area with screen accessories, such as a screen
protector or stickers. Doing so may cause the sensor to malfunction.
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Do not allow water to contact the touchscreen. The touchscreen may malfunction
in humid conditions or when exposed to water.
Hard keys
Power key
Volume key
Key Function
Power
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Press and hold to turn the device on or off.
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Press to turn on or lock the screen.
Volume
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Press to adjust the device volume.