Dialing telephone calls from Australia to Vietnam
0011
▶ 84
▶ city code
▶ local number
Step-by-step
0011
▼ This IDD (International Direct Dial) prefix tells the phone system in Australia that you are dialing an international number.
84
▼ Country code for Vietnam.
city code
▼ local number
Notes
Not sure what time it is on the other end of the line? Look here for Vietnam time, date, and time zone information.
If you are calling from a hotel or office phone system, additional steps may be required.