The Cameroon government announced bidding results on December 10.
Other renowned companies such as Bharti Airtel, Monaco Telecom, and Korea Telecom also joined the bidding process.
Under the contract, mobile phone services will cover 81 percent of the country’s territories, providing both 2G and 3G services.
Cameroon is one of few African nations that have two mobile phone service providers, and have yet to develop 3G infrastructure.
Viettel, the military - run telecom group, has expanded its operations abroad, including in Cambodia, Laos, Bangladesh, Mozambique, and Cameroon.
It aims to provide services to 500 million customers and become one of the top ten telecom investors overseas by 2015.