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This section provides detailed information about network operators worldwide that offer services from the GSM family of Wireless Communications. Specific details included within this section are network, roaming, services and coverage information for over 860 networks in 220 countries/areas of the world.

The 3rd Generation Partnership Project (3GPP) is a collaboration between groups of telecommunications associations, to make a globally applicable third generation (3G) mobile phone system specification within the scope of the International Mobile Telecommunications-2000 project of the International Telecommunication Union (ITU).

Open source apps and resources categorized by SIP, H.323, IAX, and RTP protocols. It includes clients, libraries, gatekeepers, and any other open source resource available for those specific protocols plus PBX and IVR platforms.