general assessment: Vietnam is putting considerable effort into modernization and expansion of its telecommunication system, but its performance continues to lag behind that of its more modern neighbors domestic: all provincial exchanges are digitalized and connected to Hanoi, Da Nang, and Ho Chi Minh City by fiber-optic cable or microwave radio relay networks; since 1991, main lines in use have been substantially increased and the use of mobile telephones is growing rapidly international: satellite earth stations - 2 Intersputnik (Indian Ocean region)