Mio A501 - Manual (Page 63)

Using the Phone
3-9
Ending a Call
To end a call, tap on the Phone
keypad or press the End button.
3.5
Adjusting the In-Call Volume
Adjusting the Phone Volume
To adjust the volume during a call, tap the
icon on the navigation bar to select a volume
level, or use the Volume control on the side
of the device.
CAUTION: Never raise the sound volume level
too high when using earphones. An excessive
sound volume level could cause damage to
your hearing.