English 
Tiếng Việt Viettel 3G SIM has many different types in terms of both categories and capacity. How to use Viettel 3G SIM is very simple in theory and practice, but not all consumers know how to use Viettel 3G SIM to avoid losing data. This is the reason why customers frequently call and inquire with network operators. The article below from the agent 3G SIM in Hanoi and Ho Chi Minh City - Viettel multi-network 3G modem specialized for tablets will help users answer that question. Hopefully, users will read and share with everyone so that everyone knows how to use their 3G SIM product effectively.
Some cases to note and how to use Viettel 3G SIM correctly
Not using data but data is still lost
In this case, customers should note that when they are no longer accessing the network, turn off all mobile data to avoid cases where there is no Wi-Fi but network data still runs, thus deducting from the 3G SIM capacity that the customer has mobile data turned on.
Customer has data remaining but cannot use it
For all 3 network operators package of Viettel, ...., Mobifone when your main account has less than 100 VND, you will not be able to access the network. Therefore, customers must remove the SIM and insert it into the phone to top up the card or transfer money directly to the SIM, the SIM will return to its normal state and customers can use 3G.
When mobile data is turned on, it displays no service
- May be Viettel 3G SIM is damaged due to many reasons: customer drops the device, removes SIM continuously...
- Customer turns off the machine and restarts, 3G may be displayed again
Viettel 3G SIM has been recalled to the warehouse
- For Viettel 3G SIMs in particular and 3G SIMs in general, you must connect to the network at least once every 2 months to extend the SIM's validity. Many customers have not connected to the network for several months, leading to the SIM being recalled to the warehouse.
- To ensure your rights, customers need to connect to the network for the SIM or make a text message so that their 3G SIM is not recalled to the warehouse.
Now you probably know why you lost your data while not using 3G, right? 3G WIFI always wants customers to knowhow to use Viettel 3G SIM as effectively as possible. If you need to buy a genuine Viettel 3G SIM at a cheap price, please contact us.
