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​Telecommunication
​Johannesburg is the telecomms hub of South Africa, which ranks 23rd in telecommunications development in the world. The city hosts the headquarters of numerous local and international operations, and serves as the base for multi-nationals operating in the rest of the continent.

South Africa has approximately 4.92-million installed telephones and 4.3-million installed exchange lines. This represents 39% of the total lines installed in Africa. Some 58% of Johannesburg's households had a fixed line telephone in the home in 2001, an 11% increase over five years. In 2003 the industry was reportedly worth about R81-billion. And 85 percent of the sector's activities occur in Gauteng.

South Africa's sprawling geography has required it to invest in a large transmission infrastructure that covers about 156-million circuit-kilometres. The transmission network is almost wholly digital. Digital microwave and optical fibre serve as the main transmission media for the inter-primary network, interconnecting all major centers, including Johannesburg.

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