BenQ M555C - Manual (Page 125)

109 Menus
Auto Keylock
You can set your phone to automatically lock its keypad after you
leave the keypad untouched for 20 seconds during the idle mode.
After you press ( UNLOCK ) and to unlock the keypad and
leave your phone idle for anther 20 seconds, your phone will lock its
keypad again.
Call settings
This menu provides a number of options to manage your calls.
Call waiting
When you are speaking over your phone and another call comes in,
an incoming call number and a call-waiting message will appear to
remind you. Choose to activate, cancel or check the status of this
feature.
8
The call waiting feature is network support and subscription
dependent.
Show your number
You can decide whether or not to show your number on the
recipient's phone when you make a call.
Minute minder
Your phone will beep every minute during a call.
,
However, you may not be able to make calls on certain networks if you
select Off to disable the feature. In that case please activate it by
selecting On.