Extend your device's original Manufacturers Limited Warranty for an additional 12 months.
Read more about your phone's limited warranty.
Enter *#0000# on your phone’s keypad. The display shows your phone’s model and product code.
On older phones, these numbers are printed on a white label in the battery compartment, underneath the battery.
Select Menu > Settings > Tone settings (or Tones) > Vibrating alert.
Note: If your device is powered off, the vibrating alert does not work.