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detailed description(all the information is from the internet):

Model N81 (8G)

Time-to-market: 2007
Network: standard WCDMA (3G), GSM 850/900/1800/1900
Phone shape: slide
Main display parameters: color screen, 16 million color TFT, 240 x 320 pixels, 2.4 inches
System: Symbian 9.2, Series 60 version 3
Standard configurations: lithium batteries, chargers, stereo music headphones
Talk time: 240 minutes
Standby time: 360 hours
Shell  color: diamond blue, ink  gray
Volume: 102 × 50 × 17.9mm
Weight 140 g

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Screen
2.4 Inch QVGA 16 Million Colour Screen (320 x 240 Pixels)

Imaging
2 Megapixel Camera
20 x Digital Zoom
Flash
Flash Mode (On, Off, Automatic & Red Eye Reduction)
Photo Gallery
Photo Editor
Video Player
Video Recorder (MPEG4, H264, H263, 3GPP, RealVideo 8, 9, 10)
Video Streaming
Video Editor
Video Call
Second CIF Camera
Theme Wallpapers
Theme Screensavers

Messaging
SMS (Text Messaging)
MMS (Multimedia Messaging)
Email with Attachments
Picture Messaging
SMS Distribution List
Predictive Text

Sound
Music Player (MP3 (VBR), WAV, AAC, AAC+, eAAC+, M4A & WMA)
Media Keys (Play, Pause, Stop, Rewind & Forward)
Volume Keys
FM Radio
Visual Radio
Playlists Management
5 Band Equalizer
Music Streaming (UPnP)
Bluetooth Stereo A2DP
Integrated Stereo Speakers
Headset
Nokia Podcasting
Voice Commands
Voice Recorder
MP3 & Polyphonic Ringtones
Talking Ringtones

Entertainment
Game Keys
Game Mode (Landscape or Portrait)
Embedded Games
Downloadable Games
Organiser
Contacts
Calendar
To Do List
PIM Printing
Calculator
Clock
Call Log (Missed, Received & Dialled Calls)
Speaker Independent Name Dialling (SIND)
Internet Calls VoIP
Conference Call
Push To Talk
Handsfree Speaker
Symbian OS
S60 3.1 Software

Connectivity
WLAN
3G
Bluetooth
USB
EDGE

Network
Quad Band (GSM 850, GSM 900, GSM 1800 & GSM 1900)
WCDMA 2100

Internet
Nokia Browser with Mini Map

Memory & Talk Time
MicroSD Memory Card with 2 Gbyte Card or 8 Gbytes Internal Flash Memory
4 Hours Talk Time
408 Hours Standby

Weight & Size
140 g
102 x 50 x 17.9 mm