Nokia 5 User Guide
change the volume to your liking by using the volume keys on the side of your phone.
Do not connect to products that create an output signal, as this may damage the device. Do not connect 
any voltage source to the audio connector. If you connect an external device or headset, other than 
those approved for use with this device, to the audio connector, pay special attention to volume levels.
Change the volume for media and apps
Press a volume key on the side of your phone to see the volume status bar, tap keyboard_arrow_down, 
and drag the slider on the volume bar for media and apps left or right.
Set the phone to silent
Press a volume key on the side of your phone, and tap notifications to switch to silent.
Nokia 5  Manual PDF