Nokia 5.1 user guide
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Control volume
Change the volume
If you have trouble hearing your phone ringing in noisy environments, or calls are too loud, you can 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
Set the phone to silent
To set the phone to silent, press and hold the volume down key, and then press the key again. The first press sets the phone to vibrate only, and the second press sets it to silent.
Tip: Don't want to keep your phone in silent mode, but can't answer right now? To silence an incoming call, press the volume down key. You can also set your phone to mute the ringing when you pick the phone up: tap
If you want to be able to reject an incoming call by turning over the phone, tap