Nokia N91

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 phones. At the time of release, it was the most advanced music phone ever launched by nokia. N91 also won the 'Most Innovative Product' award in recognition of its true multimedia music experience. It features a 2 megapixel camera and a 4 GB (8 GB in a revision released later that year) hard drive to store approximately 3,000 songs encoded in either AAC, AAC+, eAAC+, MP3, mp3PRO, WAV, MIDI, or Microsoft's WMA format. It is generally considered the benchmark in the music department, simply for its unparalleled sound quality through headphones. It also features 3G and Wi-Fi connectivity. The phone features a 176 x 208, 262,144 colours TFT LCD 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.

In advertisements for the phone, Nokia recommended Bose and Sennheiser headphones.

An 8 GB variant, internally known as N91-2, was also released. This upgraded model features some minor improvements in addition to the extra storage space. The most prominent feature on the N91-2, apart from the increased memory, was the inclusion of A2DP Bluetooth Profile. This profile enabled wireless music playback over Bluetooth, in full stereo (2 different channels, L+R). Compatible Bluetooth headsets were already available in the market by then. N91-2 had a distinct black color, that added to its face value.

N91-5 was a version of the N91 with the 4GB memory, but without Wifi (WLAN) and 3G Network support. It was produced by the Chinese Plant of Nokia Corporation. This model retailed for about 50 Euros less than the regular N91-1.

The N91 was discontinued late 2007 with the emergence of other N series audio convergent devices.