Nokia Universal Codes

The document provides summaries of codes and passwords used for various phone security features and functions. It discusses codes for locking the keypad, SIM cards, the phone itself, call barring settings, voicemail, and more. If codes are entered incorrectly too many times, unlock codes may be required from the service provider to regain access. The document also includes universal codes for Nokia phones to check identifiers, software versions, and toggle settings.