N91 is Nokia's first full fledged music phone with cutting-edge smart phone capabilities. A massive 4GB hard disk drive can store up to 3000 songs.         Nokia N91 delivers seamless switching between the integrated functions of music, smart phone and imaging. Always connected, it enable users to download music while on the move, add songs to their play list and share them anytime, anywhere. Supporting various digital music formats, N91 can deliver 12.5 hours of digital music from a full battery charge.    Nokia has tied up with acoustic industry leaders such as Bose, Sennheiser, JBL, and Harman Kardon to provide a range of high-quality accessories for N91,  like noise reducing headphones and desktop speaker systems.    An interesting feature is, to search for music, start typing within the player, and the result list will be refined as you type!    Robost and stylish stainless steel  body sports dedicated music keys in the front, which slide down to reveal the phone keypad.     Keypad is little cramped but not inconveniet. The blue backlight is good. N91 also supports adding of Bluetooth keyboard for rapid typing.

Nokia N91 has a 2 megapixel camera without flash which enables basic photography and video recording.
 
Support for WCDMA networks and WiFi ensures N91 user to have necessary bandwidth to make purchasing music wirelessly practical and convenient. N91 can be connected to a PC via its USB interface so that you can copy your own music files directly to the device.
 
Specifications:

Music	MP3/M4A/AAC/AAC+/WMA music support   Stereo FM Radio   record in stereo from radio or line-in   Dedicated music control buttons   3.5 mm audio output jack
Video	Video capture/playback
Camera	2 megapixel, 1600x1200 pixels, video
Messaging	MMS/EMS/SMS   Instant Messaging   Email(POP/IMAP/SMTP)   T9
Browser	WAP 2.0/xHTML, HTML
Data	GPRS Class 10 (4+1/3+2 slots), 32 - 48 kbps   EDGE Class 10, 236.8 kbps   WCDMA    3G 384 kbps   WLAN Wi-Fi 802.11b/g
Connectivty	Bluetooth v1.2 , USB 2.0
OS	Symbian v9.1, Series 60 UI 3rd Edition
Memory	30MB, 4GB internal hard disk
Frequency Compatibility	GSM 900/1800/1900Mhz, WCDMA
General	Size - 113mm x 55mm x 22mm    Weight - 160g    Battery - 190 hours standby, 3-4 hours talk time    Display - 256k color TFT, 176x208 resolution,35x41 mm   Vibra Alert
Games	Java downloadable
Others	Java (MIDP v2.0)    5-way configurable navigation key

Disadvatages:
Bulky and heavy at 160 gm
no stereo Bluetooth audio
No Infrared port
slightly cramped keypad
2 Megapixel camera and browser are average
No Card slot

Advantages:
4 GB microdrive for music, MMS, ringtones, images, video, applications
Excellent audio quality
Superb music transfer capabilities
External music controls
Built in Stereo FM Radio
Steel body
USB support
Very fast Java
An intuitive interface
Comfortable controls
 
Nokia N91 can replace the iPod in your pocket if you are a music buff as it is an all in one companion.