Many of the poorer countries in the region have vast swathes of their land not covered by GSM or any other connectivity. Sierra Leone, to pick one random example, has no coverage except in and around its capital, Freetown. It is wise not to expect coverage when travelling outside major urban centres, even to some large towns. Having said that, some vast areas have been covered by pioneering operators who cannot rely on the sort of infrastructure taken for granted in much of the rest of the world - a reliable national electricity grid to power base stations, for example. South Africa, Swazila.
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