Samsung SCH-3550 - Manual (Page 20)

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11. CLR Key: This key is used to
erase numbers or characters
you have entered incorrectly,
or to return to a previous
screen.
♦
To erase one character from
the display screen, briefly
press it once.
♦
To erase all of them, hold it
down for one second.
♦
To back up one menu level,
press it once.
♦
To return to Standby mode,
hold it down for one second.
12. END/ Power Key: Press this
key to disconnect a call or to
return to Standby mode from
any menu. Press and hold this
key to turn the phone on or
off.
♦
If the flip is already open, and
you receive an incoming call,
you can mute the ringer by
pressing
.