International Dialing Vietnam
This is the international dialing code used when dialing from Vietnam. International Dialing Vietnam Code is also known as Vietnam International Direct Dialing prefix (or IDD) is used when dialing from the Vietnam to outside Vietnam (sometimes also refers to as Vietnam international access code). Do not use Vietnam IDD code when dialing within Vietnam. By simply using the Vietnam Dialing Code before the number, it unables you to place a call to outside Vietnam from within Vietnam. Without this international dialing Vietnam Code, you will not able to place a call outside the Vietnam because the telephone exachange will not reconginize it as a valid international call.
To dial a international number outside Vietnam from within Vietnam, you have to dial International Dialing Vietnam Code or Vietnam International Direct Dialing prefix (IDD), Vietnam Country Code, City/ Area Code, and then the subscriber telephone number respectively as:
+84 (International Dialing Vietnam Code) + (Country Code) + City Area Code + Number you wish to call.
When dialing from a mobile phone outside Vietnam from Vietnam, only Dial '+' + (Country Code) + City Area Code + Number you wish to call. (The "+" is universal mobile international direct dialing prefix also includes Vietnam)
On the other hand, when dialing to Vietnam from outside Vietnam, a Vietnam Country Code is used. Vietnam Country Code however is not used when dialing within Vietnam.
The other type of code is Vietnam National Direct Dialing prefix (or NDD). It is used only when dialing to a destination within the Vietnam (Refer to dialing Vietnam code). Vietnam NDD code is only used as long distance dialing within the Vietnam. Do not use Vietnam National Direct Dialing prefix when dialing from outside Vietnam into Vietnam.
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