The Nokia N91 is a smartphone released in 2005, notable for its focus on music playback. It features a 4 GB hard drive, allowing users to store a significant number of songs, and supports various audio formats. The device also includes a dedicated music player and a 3.5mm headphone jack for enhanced audio quality. In addition to its music capabilities, the Nokia N91 offers a 2-megapixel camera and a 2.4-inch display. It runs on the Symbian operating system, providing access to various applications and features. The phone was part of Nokia's push into the multimedia smartphone market during the mid-2000s.