Provides SMS marketing and communications products. Paid service allows Web users to send e-mails and text messages to mobile phones.

Access this library and delve into an overview of speech compression. Provides other audio compression applications.

Excellent technical dissection of the history, services, architecture, and network structure of the Global System for Mobile Communications.

Have your say or make queries on GSM issues. Also includes useful info on operators, coverage & an archive of reports.

UK retailer sells GSM handsets, including products made by Nokia, Sony Ericsson, Motorola, Samsung, Siemens, and Panasonic. Shop for accessories and batteries.

UK retailer offers latest GSM handsets with a wide selection of accessories and PDAs. Mobile phones are available on all major UK networks.

Learn about Nokia's advances with this global wireless communications network. Find phones and look up technical data.

If you want details of the history and system architecture of GSM, then this academic paper is the place to start looking.