If you buy a new device, or otherwise want to dispose of your device, Nokia recommends that you recycle your device. Beforehand, remove all personal information and content from your device.
Remove all content and restore settings to the default values
Back up the content you want to keep to a compatible memory card (if available) or to a compatible computer.
Close all active connections and calls.
Select Menu > Settings and Phone > Phone management > Factory settings > Delete data and restore.
Your device switches off and then on again. Check carefully that all your personal content, such as contacts, pictures, music, videos, notes, messages, mail, presentations, games and other installed applications have been removed.
Content and information stored on the memory card or SIM card is not removed.