Huawei P9 Lite - Manual (Page 78)

Calls and Contacts
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Start a three-way call: Please contact your carrier to find out how to use this feature.
For more information, see Making a conference call .
• Adjust the volume: Press the volume up button to increase the volume, or the volume
down button to decrease the volume.
To end a call using the power button, go to Dialer, touch > Settings and
then turn on the Power button ends call switch.