World Telephone Numbering Guide

Updated 29 February 2008

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Vietnam

+84

Number Format

Area Code:            1-3 digits
Subscriber Number:    5-7 digits
Trunk Prefix:         0
International Prefix: 00

Hanoi (+84 4) and Ho Chi Minh City (+84 8) have 7-digit subscriber numbers. All other area codes have 6-digit subscriber numbers. Some non-geographic numbers have been listed as 5-digits for such networks as IM/DM (+84 69) and CP/TD (+84 80).

Area code information

1 October 2006 - subscriber numbers expanded in certain areas

'3' was prepended to 6-digit subscriber numbers in certain regions to form new 7-digit subscriber numbers. This was not a widespread or national renumbering. There was a one month permissive dialling period which ended 1 November 2006.

Old format     New format      Place
----------     ----------      -----
+84 31 xxxxxx  +84 31 3xxxxxx  Hai Phong City
+84 38 xxxxxx  +84 38 3xxxxxx  Nghe An province
+84 61 xxxxxx  +84 61 3xxxxxx  Dong Nai province

Source: MIC announcement (26 September 2007, via ITU) (News courtesy Sergiu Rosenzweig)

15 September 2006 - new Vinaphone mobile range

Vinaphone mobile numbers were assigned the new number range +84 94 xxxxxxx.

Source: MIC announcement (26 September 2007, via ITU) (News courtesy Sergiu Rosenzweig)

May 2004 - numbering plan

As of May 2004, the following applies in Vietnam:

Subscriber numbers (regardless of area code) belong to carriers according to the following pattern:

Number range   Local Carrier
============   =============
2xxxxxx        Viettel
4xxxxxx        Saigon Postel Telecom (SPT)
5xxxxxx        Viet Nam Posts and Telecommunications Corporation (VNPT)
6xxxxxx        Viet Nam Posts and Telecommunications Corporation (VNPT)
7xxxxxx        Viet Nam Posts and Telecommunications Corporation (VNPT)
8xxxxxx        Viet Nam Posts and Telecommunications Corporation (VNPT)
9xxxxxx        Viet Nam Posts and Telecommunications Corporation (VNPT)

Mobile area codes are as follows:

Number range     Mobile carrier
============     ==============
+84 90 xxxxxxx   MobiFon
+84 91 xxxxxxx   VinaPhone
+84 95 xxxxxxx   S-Fone (new carrier)

1xxx short codes are for home country direct, data, internet, special and premium services. 171 is VOIP short code (Voice Over Internet Protocol).

Source: Viet Nam Posts and Telecommunications Corporation (VNPT) announcement, (27 May 2004, via ITU)..

15 February 2004 - new VinaPhone subscriber number range

+84 91 27xxxxx, +84 91 42xxxxx, +84 91 90xxxxx are new VinaPhone mobile number ranges from 15 February 2004.

1 January 2004 - new MobiFon subscriber number range

+84 90 90xxxxx is a new MobiFon range from 1 January 2004.

1 June 2001 - GSM mobile subscriber number expansion

On 1 June 2001, GSM mobile subscriber numbers on area codes +84 90 (MobiFone) and +84 91 (VinaPhone) were expanded from 6 to 7 digits by prepending the digit '3'.

Sources:

1. VNPT Announcement.

2. VNPT announcement (via ITU, 2001).

10 October 1999 - Hung Yen and Hai Duong area codes change

From 10 October 1999, Hai Duong provincial area code became +84 320 (0320 domestically) and Hung Yen provincial area code became +84 321 (0321 domestically). These replace the area code +84 32 (or 032 domestically) which covered both provinces until that time.

This change was implemented with the installation of an NEAX 61S telephone switch in Hung Yen. The area code changes also reflect the political split of the Hai Hung province into Hai Duong and Hung Yen provinces as of 1 July 1997.

See VNPT press release for details.

12 September 1999 - Binh Duong and Binh Phuoc area codes change

From 12 September 1999, Binh Duong provincial area code became +84 650 (0650 domestically) and Binh Phuoc provincial area code became +84 651 (0651 domestically). These replace the area code +84 65 (or 065 domestically) which covered both provinces until that time.

See VNPT press release for details.

1 April 1999 - Vinh Phuc and Phu Tho area codes change

From 1 April 1999, Vinh Phuc provincial area code became +84 211 (0211 domestically) and Phu Tho provincial area code became +84 210 (0210 domestically). These replace the area code +84 21 (or 021 domestically) which covered both provinces until that time. 6-digit subscriber numbers were not changed.

See VNPT press release for details.

October 1998 - Sufficient advance notice policy for number changes

Telephone subscribers are to be given at least 60 days notice for any numbering changes, according to policy decreed 16 October 1998.

See VNPT press release for details.

29 February 1996: national renumbering

Vietnam's telephone numbers were expanded by 1 digit nationally on 29 February 1996. Subscriber numbers in Hanoi and Ho Chi Minh City were changed from 6 to 7 digits. Elsewhere, subscriber numbers changed from 5 to 6 digits. No other details on the renumbering are known.

Source: VNPT 1996 news summary.

Other Information

See Vietnam Posts and Telecommunication Corp. site for news and information.

Also see numbering document (via ITU).

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