Vittel Vietnam
Viettel Group is a Vietnamese major mobile network operator headquartered in Hanoi, Vietnam. Operated in 2004 as a GSM launcher, Viettel Mobile is the fourth network in Vietnam (after Mobifone, Vinaphone and S-Fone) and currently the biggest telecommunications provider, contributing 40.37% to the total mobile communication market ( followed by MobiFone (27.95%) and Vinaphone (22.98%)and 3% of S-Fone).