Quick tips about Vietnam
Official Currency: Dồng (₫). It is best to use local currency as most places only accept cash. And there may be opportunities to pay in USD in certain places but make sure they are crisp bills. Credit cards are not as widely accepted but make sure you bring it along with you.
Electricity: The standard voltage is 110 /220 V. The power socket types A, C and D can be used in Vietnam. Check here to determine if you need to bring a travel adapter.
Data and Wifi: Vietnam has reliable cell phone services. SIM cards are affordable. Most places in Vietnam have wifi but if you want to make sure you are always connected, purchase a SIM card once you arrive in Vietnam.