1. press volume up button
2. press home button
3. press power on/off button
- press all step on the same time..
- hold it until the screen show restore menu.
- choose "wipe data/factory reset..
- after finishing it,choose reboot now to complete u'r reset..
**use volume button to choose menu...
**use home button to select..
OR
1. go to setting - privacy - factory data reset.
2.dial *2767*3855#
