The Nokia N91 is a mobile phone that was released to the public in April of 2006. It is part of the Nokia Nseries range of mobile phone. It features a 2-megapixel camera and a 4GB (8GB in the "new" 2006 version) hard disk to store approximately 3,000 songs encoded in either AAC, AAC+, eAAC+, MP3, mp3PRO, WAV, MIDI, or Microsoft's WMA format. It also features 3G and wi-fi technology. The phone features a 176 x 208 color display and dedicated music functionality buttons (XpressMusic) that slide down to reveal traditional mobile phone keys. Battery life when solely playing music has been estimated at 12 hours.
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 new version is needed for the support of a mechanical hard disk. In the past, the version of the Symbian operating system has been a good indicator of cpu speed.
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