Summary
Mobile networks require a complex infrastructure, mirroring that of the telephone network and the Internet.
Voice networks are formed from MSCs (Mobile Switching Centers), the equivalent of telephone exchanges. GPRS networks are formed from SGSNs (Serving GPRS Support Nodes), equivalent to Internet routers.
A WAP Gateway allows users to dial up a network from their mobile phones. A WAP server is equivalent to a Web server.
Open WAP networks allow access to any site. Closed WAP networks allow access only to those of the operator and its partners.
Internet phones require IP addresses, which are in very short supply.
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