Zte MF58 - Adjusting Speaker Volume

ZTE MF58
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Press “9” key to increase camera brightness.
Note: The key operations only function during the video call process.
Adjusting speaker volume
In the process of a video call, you can adjust the volume by pressing “#”key and “*” key.
There are 5 levels of volume: silent, low, normal, high and maximum. Press “#” key to
increase volume. Press “*” key to decrease volume.
Note: Speaker will be set to silence by default when video call is connected.
This Manual: http://www.manuallib.com/file/2593400