LG CU920 - Manual (Page 109)

<< 105 Settings Menu
Handset Information
This menu is used to view My Numbers, Manufacturer and Model Name information
etc.
Reset Settings
This function allows you to restore factory settings. To do this, you need the security
code.
Master Reset
Restores the settings (e.g.: Audio, Display, Language, Date & Time, Bluetooth
Settings) stored in the handset memory to default values.
Master Clear
Deletes downloaded/user created contents (e.g.: images, videos) from Handset
content and the External Memory card.