BenQ M555C - Manual (Page 55)

39 Using your phone
Your phone will only vibrate to alert you to an incoming call when the
silent profile is activated. To deactivate the silent profile and return to the
previous profile, long press .
8
To set up and choose profiles, please open the main menu and
select the Profiles menu. See page 123.
/
The feature of long-pressing to switch to the silent profile is very
convenient for profile switch during a meeting.
,
The silent profile activated by long pressing from the idle screen is the
same as the one you activate from the menu: Profiles --> Select profile -
-> Silent.
Therefore, if you go to: Profiles --> Edit profile --> Silent and adjust the
ringing volume to the desired level between level 1 and Loudest, long
pressing from the idle screen will not activate the silent mode.
Likewise, if you follow the same path to disable the silent profile's vibration,
long pressing from the idle screen will not turn on the vibration.