Tip! To lock the device manually, press . A list of commands opens. Select Lock phone. For information on Lock switch see ‘Keypad lock (keyguard)’, p. 17.

Lock if SIM changed—You can set the device to ask for the lock code when an unknown SIM card is inserted into your device. The device maintains a list of SIM cards that are recognised as the owner’s cards.

Closed user group (network service)—You can specify a group of people to whom you can call and who can call you.

When calls are limited to closed user groups, calls still may be possible to the official emergency number programmed into your device.

Confirm SIM services (network service)—You can set the device to display confirmation messages when you are using a SIM card service.

Glossary of PIN and lock codes

If you forget any of these codes, contact your service provider.

Personal identification number (PIN) code—This code protects your SIM card against unauthorised use. The PIN code (4 to 8 digits) is usually supplied with the SIM card. After three consecutive incorrect PIN code entries, the PIN code is blocked, and you need to unblock it before you can

use the SIM card again. See the information about the PUK code in this section.

UPIN code—This code may be supplied with the USIM card. The USIM card is an enhanced version of the SIM card and is supported by UMTS mobile phones. The UPIN code protects the USIM card against unauthorised use.

PIN2 code—This code (4 to 8 digits) is supplied with some SIM cards, and is required to access some functions in your device.

Lock code (also known as security code)—This code (5 digits) can be used to lock the device to avoid unauthorised use. The factory setting for the lock code is 12345. To avoid unauthorised use of your device, change the lock code. Keep the new code secret and in a safe place separate from your device.

Personal unblocking key (PUK) code and PUK2 code—These codes (8 digits) are required to change a blocked PIN code or PIN2 code, respectively. If the codes are not supplied with the SIM card, contact the operator whose SIM card is in your device.

UPUK code—This code (8 digits) is required to change a blocked UPIN code. If the code is not supplied with the USIM card, contact the operator whose USIM card is in your device.

Tools

Copyright © 2005 Nokia. All rights reserved.

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N91 specifications

The Nokia N91, launched in 2005, marked a significant milestone in the evolution of mobile phones, particularly as a music-centric device. Positioned as a multimedia smartphone, the N91 was tailored for music enthusiasts and boasted an array of features that set it apart from its contemporaries.

One of the standout characteristics of the Nokia N91 was its impressive storage capacity. It came equipped with an internal hard drive, offering 4GB of storage—an astounding amount for its time. This allowed users to store a substantial library of songs, making it one of the first phones to integrate such extensive media storage into its design.

The N91 featured a robust media player capable of handling various audio formats, including MP3, AAC, and MPEG-4. The user interface was designed to facilitate easy navigation through song libraries and playlists, catering to users who desired quick access to their favorite tracks. It also supported playlists and allowed for easy synchronization with a PC, enhancing the user experience.

In terms of connectivity, the Nokia N91 supported Wi-Fi and 3G networks, providing fast data access for downloading music and streaming content. The inclusion of Bluetooth technology was another highlight, allowing users to connect wireless headphones or speakers with ease. These features made the N91 not just a phone but a fully-fledged portable media player.

The device featured a striking design, with a metallic finish and a sleek form factor that appealed to style-conscious consumers. The 2.4-inch TFT display was optimal for viewing album art and managing playlists. Additionally, the N91 included a dedicated music control interface with physical buttons, making it convenient for users to control playback without having to navigate through menus.

On the photography front, the Nokia N91 had a 2-megapixel camera, a respectable feature for the time, allowing users to capture memories alongside their music experiences.

With its robust battery life and features tailored for music consumption, the Nokia N91 paved the way for future smartphones, blending phone capabilities with a rich multimedia experience. It remains a notable device in Nokia's legacy, representing an era where mobile phones began to transition into multifunctional gadgets that catered to a range of user needs beyond communication.
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