By Fumbuka Ng'wanakilala DAR ES SALAAM (Reuters) - Tanzania has granted a licence to Vietnam-based telecoms operator Viettel to build a third-generation (3G) mobile phone network in the east African country, a senior official said. - --Viettel will compete with the four other main operators: Vodacom Tanzania, a unit of South Africa's Vodacom; Bharti Airtel; Tigo Tanzania, part of Sweden's Millicom; and Zantel, a unit of Etisalat. - --Three other mobile phone operators - state-run TTCL, Benson and Smart - have a tiny market share. Viettel will start building its national network on Nov. ...

More...