Full meanings, those we don't know...

* AVI = Audio Video Interleave

* RTS = Real Time Streaming

* SIS = Symbian OS Installer File

* AMR = Adaptive Multi-Rate Codec

* JAD = Java Application Descriptor

* JAR = Java Archive

* JAD = Java Application Descriptor

* 3GPP = 3rd Generation Partnership Project

* 3GP = 3rd Generation Project

* MP3 = MPEG player lll

* MP4 = MPEG-4 video file

* AAC = Advanced Audio Coding

* GIF = Graphic Interchangeable Format

* JPEG = Joint Photographic Expert Group

* BMP = Bitmap

* SWF = Shock Wave Flash

* WMV = Windows Media Video

* WMA = Windows Media Audio

* WAV = Waveform Audio

* PNG = Portable Network Graphics

* DOC = Document (Microsoft Corporation)

* PDF = Portable Document Format

* M3G = Mobile 3D Graphics

* M4A = MPEG-4 Audio File

* NTH = Nokia Theme (series 40)

* THM = Themes (SonyEricsson)

* MMF = Synthetic Music Mobile Application File

* NRT = Nokia Ringtone

* XMF = Extensible Music File

* WBMP = Wireless Bitmap Image

* DVX = DivX Video

* HTML = Hyper Text Markup Language

* WML = Wireless Markup Language *CD - Compact Disk.

* DVD - Digital Versatile Disk.

* CRT - Cathode Ray Tube.

* DAT - Digital Audio Tape.

*DOS - Disk Operating System.

* GUI - Graphical User Interface.

* HTTP - Hyper Text Transfer Protocol.

* IP - Internet Protocol.

* ISP - Internet Service Provides.

* TCP - Transmission Control Protocol.

* UPS - Uninterruptible ­ Power Supply.

* URL - Uniform Resource Locator.

* USB - Universal Serial Bus.

* VIRUS - Vital Information Resource Under Seized.

* 3G - 3rd Generation.

* GSM - Global System for Mobile Communication.

* CDMA - Code Division Multiple Access.

* UMTS - Universal Mobile Telecommunication System.

* SIM - Subscriber Identity Module.

* HSDPA - High Speed Downlink Packet Access.

* EDGE - Enhanced Data Rate For GSM [ Global System for Mobile Communication] Evolution.

* VHF - Very High Frequency.

* UHF - Ultra High Frequency.

* GPRS - General Packet Radio Service.

* WAP - Wireless Application Protocol.

* TCP - Transmission Control Protocol ­.

* ARPANET - Advanced Research Project Agency Network.

* IBM - International Business Machine Corporation.

* HP - Hewlett Packard.

* AM/FM - Amplitude/ ­Frequency Modulation.

* WLAN - Wireless Local Area Network