-68% use mobile communication service. -Viettel 62%, MobiFone 22.5%, Vinaphone 13% -Viettel has the second to none popularity in other areas except Ho Chi Minh where the competition with MobiFone is tougher. -90% of users prepay, and most of post-paid users are full-time employment. -MobiFone had the highest satisfaction score in all categories. Viettel is stronger in all area except HCMC than in only HCMC.