English 
Tiếng Việt Viettel is the mobile network operator providing the largest 3G network in Vietnam. However, we don't always need 3G and want tocancel Viettel 3G. When you no longer need to use 3G, please use the cancellation method below.
The simplest way to cancel Viettel 3G
To cancel Viettel's 3G service, text the following message to the switchboard:
- Huy send to 191
After texting, wait a moment for the system to send back a message asking you to confirm the cancellation of Viettel 3G, then text again to confirm the cancellation.
- Y send to 191
This completes the process of canceling Viettel's 3G service. And next are some notes you shouldn't ignore after canceling the 3G service.
Notes after canceling Viettel 3G
After canceling Viettel 3G, the system will set your line to the default 3G mode, meaning you can still use 3G without registering again. 3G usage costs will be deducted directly from your primary account. The default 3G charges are very expensive, so be mindful of limiting its use. If you don't need to use it, turn off 3G on your phone.
It is recommended to turn off 3G mode after canceling Viettel 3G
Why you lose money after canceling 3G registration
The reason is that you still have 3G turned on and apps running in the background, as well as apps that auto-update. Therefore, you must turn off the data connection on your phone.
Usually, devices have a quick settings panel accessed by swiping down from the top or up from the bottom. Please tap to turn off the data connection.Wishing you success and no loss of money after canceling Viettel 3G.
>>> Want to use high-speed 4G? Use: 4G WiFi Router
Article updated and revised on 04/27/2018
