Samsung SPH-A420 User Manual page 18

You can switch the phone to Silent
Silent mode/
mode or Vibration mode to avoid
Vibration mode
disturbing other people.
To activate Silent mode:
1. In Idle mode, press [ / ] until
Silence All displays.
2. Press <Done>.
To activate Vibration mode:
1. In Idle mode, press [ / ] until
Vibrate All displays.
2. Press <Done>.
You can protect the phone against
Phone lock
unauthorised use with a phone
password.
1. In Idle mode, press [MENU
OK] and select Settings →
Security.
2. Enter the default password, the
last 4-digit of your phone
number.
3. Select Change Lock.
4. Enter a new 4-digit password
and press <Next>.
5. Enter the new password again
and press <Done>.
6. Select Lock Phone.
7. Select Lock Now or On
Power-Up.
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