Dau Tu Va Phat Trien Vien Thong Viet Nam Joint Stock Company Address: No 43 Nguyen Cong Hoan, Ngoc Khanh Ward, Ba Dinh District, Ha Noi City Enterprise code: 0101385620 Phone: 0247714206 Representative: Do Quy Dung Adress: No 59, Hang Thiec Street, Hang Gai Ward, Hoan Kiem District, Ha Noi City Ngoc Khanh Ward, Ba Dinh District, Ha Noi CityFounding date: 23 - 7 - 2003