Tigo Senegal has announced that it has invested more than XOF50 billion (USD100.5 million) in expanding and improving its network, reports Agence Ecofin. The cellco, which is owned by Millicom International Cellular (MIC) says that the expenditure has boosted 3G and 3.5G coverage in Dakar and in the central regions of the country, with speeds up to 21Mbps available. More than 300 telecoms sites have been upgraded in recent years, and improvements are earmarked for 177 new areas in 14 regions.