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.