Go to Vietnam 1 1 day. What kind of Internet traffic is appropriate to buy?

I just came back from Vietnam and provided some information about Vietnamese mobile phone cards. There are four mobile operators in Vietnam, namely Vinaphone and MobiFone, a subsidiary of VNPT (Vietnam Post and Telecommunications Group). Military communication company Viettel；; A consortium of EVN Telecom and Hanoi Telecom.

The card I bought is Viettel, 30,000 VND, with 50,000 D in it. After I get the card, I will send a DK to 19 1 first, and then the system will return a short message with the basic information of each package. If you need any package, just reply to the corresponding package number. The D25 package I chose contains 30 MB of GPRS traffic, which is for calling me. However, it is very important to be able to connect to the GPRS network at any time, so I choose the Internet package. In addition, dial * 10 1# directly to check the phone bill balance, and dial * 102# to check the remaining GPRS traffic.