The Nokia N91 is first and foremost a music phone, and that 4GB of storage capacity is enough for hundreds of tunes. The unique selling point of the Nokia N91 is that it is the first Nokia phone to be equipped with a hard drive. The music player supports a wide range of formats, including MP3, AAC and AAC+. It is part of the Nokia Nseries range of mobile phone. The phone features a new version of the Symbian Series 60 Operating System. It was the first phone with this version (Symbian version 9.1, Series 60 version 3.0). The opening mechanism is quite unique on the N91. The screen has an automatic brightness control for the display & keypad. The Nokia N91 comes with an integrated 2 megapixel camera complete with 6 x digital zoom which is prefect for capturing all of those special memories.