Samsung J3 Pro User Manual page 7

Basics
Do not cover the antenna area with your hands or other objects. This may cause
connectivity problems or drain the battery.
Using a Samsung-approved screen protector is recommended. Unapproved screen
protectors may cause the sensors to malfunction.
Do not allow water to contact the touchscreen. The touchscreen may malfunction
in humid conditions or when exposed to water.
Keys
Key
Power
Recents
Home
Back
Volume
Function
Press and hold to turn the device on or off.
Press to turn on or lock the screen.
Tap to open the list of recent apps.
Press to turn on the screen while the screen is locked.
Press to return to the Home screen.
Tap to return to the previous screen.
Press to adjust the device volume.
7