Vietnam is one of Southeast Asia’s fastest-growing economies, making it a vital market for global businesses seeking new customers and stronger regional presence.
But until now, maintaining International Toll-Free Service (ITFS) coverage in Vietnam meant juggling multiple toll-free prefixes across different local telecom operators to ensure complete coverage. This created operational complexity for enterprises and confusion for customers.
That’s about to change. A new update to Vietnam’s ITFS structure will simplify nationwide toll-free coverage, making it easier and more reliable for international businesses to connect with their audience.
We’ll also explain how United World Telecom is supporting customers through this transition.
Understanding the Change in Vietnam Toll-Free Services
For many years, maintaining full ITFS coverage across Vietnam required businesses to manage multiple toll-free prefixes.
These prefixes and Vietnam toll-free numbers were historically segregated, with each one tied to a specific major domestic telecommunications operator — like VNPT, Viettel — leading to a fragmented setup:
| Vietnam Domestic Operator | Associated ITFS Prefix |
| Viettel | 122 |
| VNPT | 120 |
| Mobifone | 121 |
This meant that companies had to provision multiple numbers just to ensure complete reach across all Vietnamese networks.
The Upcoming Vietnam ITFS Consolidation in 2025
Effective October 31, 2025, Mobifone will officially discontinue support for all ITFS numbers beginning with the 121 prefix. Instead, Mobifone traffic will be consolidated under the 120 prefix (VNPT).
Here’s what used to be the situation and how this change simplifies nationwide coverage:
1. ITFS Reach
Previously: To achieve full reachability across all mobile and landline networks in Vietnam, providers needed to secure ITFS numbers with three separate prefixes (122, 120, and 121).
Now: Full reachability will be achieved with just two prefixes (120 and 122).
2. Complexity
Previously: The system was fragmented and complex, requiring multiple numbers and causing confusion about network reachability (i.e. which number was reachable from which network).
Now: The ITFS framework becomes easier to manage and requires fewer resources for nationwide coverage.
3. Risk of Missed Calls
Previously: If a business only held a 122 number, it would be unreachable by VNPT and Mobifone customers, severely limiting potential calls and business.
Now: Centralized coverage ensures VNPT and Mobifone customers can both reach 120-prefixed numbers.
How Will Vietnam’s ITFS Change Affect Your Business?
For global enterprises, this change means lower complexity and stronger reach, helping sales and support teams connect more efficiently with customers in Vietnam:
- Toll-free access in Vietnam becomes consolidated under the 120 and 122 prefixes.
- One prefix means nationwide reach, including VNPT, Mobifone, and Viettel users.
- Simpler provisioning and management for international businesses.
- Improved call reliability and consistency across all major Vietnamese networks.
- Streamlined alignment with Vietnam’s telecom framework.
United World Telecom: Your Trusted Partner
United World Telecom — with 29+ years of experience in supporting global telecom transitions — continues to monitor regulatory updates to help businesses remain compliant and connected worldwide. We offer expert guidance to help you assess your current ITFS setup and maintain the widest possible reach for your customers in Vietnam.
Supported by a robust global network and Tier-1 carrier partnerships, United World Telecom delivers reliable, high-quality ITFS connections to the Vietnamese market. Our team, well-versed in local compliance across APAC, is ready to assist you through this change and ensure a smooth, uninterrupted communication experience for your customers.
Connect with our APAC team to learn more about this change or other options for Vietnam phone numbers. Call us at +66 (60) 002-4172 or chat with us online!