News Celtel upgrades African mobile network By Oluniyi D. Ajao - 5th November 2005 Celtel International, with the help of Telefonaktiebolaget LM Ericsson, is upgrading its network to carry a higher volume of voice and data traffic in Kenya, Uganda and Tanzania. RelatedTigo Wins 2023 Fastest Mobile Network Award in TanzaniaISPA warns against forced fibre upgrades