It also featured the industry-standard 3.5 mm headphone jack, and was anticipated as a major challenger to Apple, whose iPod dominated the industry.

It was expected to begin shipping by the end of 2005; but in September that year the device was delayed till 2006.

[6] It features a 2-megapixel camera and a music player playing 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.

This upgraded model features some minor improvements in addition to the extra storage space.

This profile enabled wireless music playback over Bluetooth, in full stereo (2 different channels, L+R).

In the Philippines, there was an incident involving an N91 being used with one of Nokia's 46 million recalled BL-5C lithium-ion batteries,[8] and exploded as a result.