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A major success factor of mobile telephony in Africa is the scarce diffusion of PSTNs (fixed line networks). In 2000, Sub-Saharan Africa as a whole had fewer telephone lines than Manhattan alone. Fixed line networks hardly reach the remote rural areas where a relevant percentage of the African population lives. Of about 400.000 rural settlements that are estimated to exist in Africa, less than 3% have PSTN access. Mobile telephony providers have taken advantage of this situation, implementing a very aggressive diffusion strategy for mobile networks. In 2006, 45% of rural settlements in Africa had GSM coverage. More recently, coverage has reached 90% of the territory in several countries, including Comoros, Kenya, Malawi, Mauritius, Seychelles, South Africa, and Uganda. Other countries that in 2007 reached above 50% of GSM coverage are Botswana, Burkina Faso, Burundi, Cape Verde, Guinea, Namibia, Rwanda, Senegal, Swaziland, and Togo. As a consequence of the larger diffusion of GSM networks over fixed line networks, "mobile-telephone booths" are common in some areas of Africa.