1. Restart your phone.
Remove the battery, and put it back into the phone. Switch your phone on.
2. Restore the original factory settings
Select Menu > Settings > Rest. factory sett. There are two options to follow, depending on whether:
- The phone keeps the personal data, select Settings only.
- The phone resets all preference settings and delete all personal data, select All.
You will be prompted to type in the security code to perform the above actions.