- Ministry of Information & Communications
- Ministry of Defense
- Ministry of Police
- Viettel and its top subsidiaries (Viettel Network, Viettel Global, Viettel Construction, etc.)
- VNPT and its top subsidiaries (VMS, VNP, VTN, VTI, VDC) and about 60 provincial telcos including Hanoi, HCMC, Danang, Hai Phong, Thanh Hoa, Khanh Hoa, Can Tho, Vung Tau, etc.
- Mobifone and its top subsidiaries.
- EVN and its top subsidiaries (EVNTelecom, Dong Nai PC, PC1, PC2, PC3, etc.)
- VTV Cab (Vietnam Cable TV)
- Vietnam National University, Hanoi
- Hanoi University of Science and Technologies
- Research Institute of Post & Telecom (RIPT)
- VNPT-Fujitsu Telecom (VFT), Elinco, Kasati, Postef, Arrive Technologies Vietnam (ATVN), CMC Telecom, etc.
- Mobile Service Centers of Nokia, Ericsson, Samsung, LG, etc.