Dau Tu Phat Trien Vien Thong Thang Long Joint Stock Company Address: No 14, Lane 161, Hoa Bang Street (Civil Group 29), Yen Hoa Ward, Cau Giay District, Ha Noi City Enterprise code: 0102527412 Phone: 02437737326 Representative: Phi Diem Hang Adress: No 95B, Kham Thien Street, Kham Thien Ward, Dong Da District, Ha Noi City Yen Hoa Ward, Cau Giay District, Ha Noi CityFounding date: 22 - 11 - 2007