Samsung SM-A505FN/DS User Manual page 13

Basics
Connectivity problems and battery drain may occur in the following situations:
– 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
Using a Samsung-approved screen protector is recommended. Unapproved screen
protectors may cause the sensors to malfunction.
Do not cover the proximity/light sensor area with screen accessories, such as a
screen protector or stickers. Doing so may cause the sensor to malfunction.
Hard keys
Key
Power
Volume
Function
Press and hold to turn the device on or off.
Press and hold to start a conversation with Bixby. For more
information, refer to
Using Bixby.
Press to turn on or lock the screen.
Press to adjust the device volume.
13
Volume key
Power key
Waking up Bixby using the Power key and