Vietnam telephone numbering changes – February to June, 2017

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From February 11 to June 17, 2017 Vietnam implemented an update of its geographical area code system. The change aims to unify the country’s landline telephone numbering format and will result in all traditional PSTN phone numbers comprising 10 digits, area code included. Previously Vietnam used 9 and 10 digit telephone numbers.

Hanoi and Ho Chi Minh City have gone from 1 to 2 digit area codes. The rest of Vietnam’s provinces now use 3 digit area codes. The following provinces get to keep their old area codes: Vinh Phuc (211), Phu Tho (210), Hoa Binh (218) and Ha Giang (219).

Our How to call Vietnam page has up to date information on dialing to this country.

[admin]

From September 15, 2018 until June 30, 2019 all 10 digit mobile phone numbers of the format 1xx xxx xxxx will change to 9 digits. The change consists in replacing the initial 3 digits with two (different) digits:

120 xxx xxxx becomes 70 xxx xxxx

In the same way the following 3 digit prefixes have changed or are about to change:
121 becomes 79
122 >> 77
123 >> 83
124 >> 84
125 >> 85
126 >> 76
127 >> 81
128 >> 78
129 >> 82
162 >> 32
163 >> 33
164 >> 34
165 >> 35
166 >> 36
167 >> 37
168 >> 38
169 >> 39
186 >> 56
188 >> 58
199 >> 59
992 >> 672 (VSAT)

More on this:
https://en.sggp.org.vn/11-digit-mobile-phone-numbers-to-be-changed-to-10-digits-post72417.html

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