How to switch Viettel 4G SIM after 28-2

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Ngày cập nhật gần nhất: 15/4/2026

Hello Mytour.vn, I'm a Viettel subscriber and I'd like to ask how to switch Viettel 4G SIM after 28-2. Is it still possible because I haven't had the chance to do it before?

Hello there! Firstly, Mytour.vn is delighted to receive your inquiry.

As you may be aware, Viettel recently offered free support for users to switch to Viettel 4G SIM at transaction points. However, this offer only applies until the end of 28-2. So, how can you switch to Viettel 4G SIM after 28-2? Mytour.vn will explain as follows:

In the latest announcement from Viettel received by Mytour.vn from Viettel Telecom, Viettel stated that switching to Viettel 4G SIM after 28-2 can still be done normally. However, this free Viettel 4G SIM switch program is only applicable until June 30, 2017.

Additionally, you can easily switch to Viettel 4G SIM via USSD operation as follows:

Access the dialer and enter code *098*2# or *098*4# for mobile, Dcom subscribers, and press Call.

However, to do this, you need to have successfully changed to Viettel 4G SIM.

Some notes about 4G network usage on current phones:

- The actual 4G network speed still depends on various conditions such as: usage location, subscription package, 4G access capability on the device, service provider network, 4G signal.

- To ensure stable 4G access, it's recommended to use and buy genuine 4G mobile devices in Vietnam instead of locked or imported devices currently being sold to avoid cases that do not meet domestic standards.

Besides, you also need to know how to activate and use 4G on your phone. If you don't know how to turn on 4G on your device, you can refer to the article Turn on 4G on phone Android, iPhone, WinPhone to do this.

If your device cannot activate 4G network following the steps in the article guiding how to activate, turn on 4G on your phone, then it is likely that your device does not support 4G usage. To clarify this issue, you can perform the check to see if your phone supports 4G as outlined in the article checking if your phone supports 4G previously published and guided by Mytour.vn.

https://Mytour.vn/cach-doi-sim-4g-viettel-sau-28-2-nhu-the-nao-18253n.aspx
Here is the article answering the question about how to change Viettel 4G SIM after 28-2, hope this is the desired answer for you as well as helps you in using current mobile devices.

Frequently Asked Questions

Is it still possible to switch to a Viettel 4G SIM after February 28?

Yes, you can still switch to a Viettel 4G SIM after February 28. The free switching program is available until June 30, 2017, allowing users to transition smoothly to a 4G SIM.

What are the steps to switch to a Viettel 4G SIM using USSD?

To switch to a Viettel 4G SIM via USSD, dial *098*2# or *098*4# on your mobile device and press Call. Ensure that you have previously changed to a Viettel 4G SIM to proceed.

What factors affect the actual 4G network speed on my phone?

The actual 4G network speed depends on various conditions, including your location, subscription package, device capabilities, and the service provider's network signal strength. Using a genuine 4G mobile device is recommended for optimal performance.

How can I check if my phone supports 4G network usage?

You can check if your phone supports 4G by following the guidelines provided in Mytour.vn's article on checking 4G compatibility. If your device does not activate 4G after following the steps, it likely does not support the network.

What should I do if I cannot activate 4G on my device?

If you cannot activate 4G on your device, it may not support the 4G network. Refer to the article on turning on 4G for detailed instructions or contact Viettel support for further assistance.

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