Vietnam phone code +84: mobile format & how to dial

Key facts

International code+84

International format+84 XX XXX XXXXe.g. +84 91 234 5678

Mobile prefixesXX XXX XXXXe.g. 91 234 5678

Mobile length9 digits

Landline format0XX XXXX XXXXe.g. 024 3123 4567

Domestic trunk0

How to read a number

+84912345678

+84Country code: Vietnam.
91Network code: Written 091 domestically — the 0 is the trunk prefix. Each network code originally belonged to one carrier (091 is VinaPhone); since number portability arrived in November 2018 it only shows the original carrier.
2345678Subscriber number: 7 digits.

Domestic format: 091 234 5678. In 2018 mobile numbers went from 11 to 10 digits; old ranges like 0120 and 0162 became new codes such as 070 and 032.

This section checked 2026-09-13. Sources: thuvienphapluat.vn/phap-luat/danh-sach-dau-so-dien-thoai-viet-nam-cua-cac-nha-mang-hien-nay-ma-vung-so-dien-thoai-viet-nam-la-ba-576719-134504.html · mst.gov.vn/sau-1-nam-thuc-hien-chuyen-mang-giu-so-nha-mang-nao-dang-chiem-uu-the-197140385.htm

Number ranges & quality

Range	Type	Notes
`Starts with 03x–09x`	Mobile carrier	Vietnamese mobile ranges (originally 09x, later expanded to 03x–08x).

Intl SMSStable

Virtual-number riskMedium

ID requiredRegistration is mandatory: foreigners use a passport, and since 15 April 2026 face biometrics and video verification are also required, with existing numbers re-authenticated within 60 days.

Vietnam is on the supported list of both AI platforms and Gemini.

Carriers & prefixes

Mobile prefixes by carrier.

Number portability applies — a prefix only shows the original carrier. Since November 2018.

Viettel Mobile carrier

032~039, 086, 096~098
VinaPhone Mobile carrier

081~085, 088, 091, 094
MobiFone Mobile carrier

070, 076~079, 089, 090, 093
Vietnamobile Mobile carrier

056, 058, 092

Show 2 more

Gmobile Mobile carrier

059, 099
Itelecom MVNO

Host network: VinaPhone

087

This section checked 2026-09-13. Sources: mst.gov.vn/sau-1-nam-thuc-hien-chuyen-mang-giu-so-nha-mang-nao-dang-chiem-uu-the-197140385.htm · thuvienphapluat.vn/phap-luat/danh-sach-dau-so-dien-thoai-viet-nam-cua-cac-nha-mang-hien-nay-ma-vung-so-dien-thoai-viet-nam-la-ba-576719-134504.html

SIM cards & keeping a number

Vietnam keeps tightening SIM registration. Under Decree 163/2024 and Circular 08/2026 (effective 15 April 2026), foreigners register with a passport valid for their visa or visa-free stay; details are checked against the exit-entry database, with face biometrics and a video-call check. Existing passport-registered numbers had to re-authenticate within 60 days of the circular (around mid-June 2026) or face one-way then two-way suspension and possible termination.

Changing phones also triggers re-authentication: outgoing calls and SMS are cut first, and without face authentication within 30 days the line is suspended both ways and terminated a few days later. That makes keeping a number from abroad hard, and SIMs bought online in someone else’s name are riskier still.

Local prepaid (Viettel etc.)

Local prepaid

Network: Viettel / VinaPhone / MobiFone
Price: Depends on top-up; days added per top-up are set by the operator
Keeping the number: Top up regularly. After expiry the line is suspended one-way, then two-way, and finally the number is reclaimed; sources disagree on the days for each stage — check with the operator. Authentication under Circular 08/2026 is also required, or the line is suspended.
ID check: Passport (valid for the visa or visa-free stay) plus exit-entry data check, face biometrics and video-call verification; the first three numbers per operator need a signed confirmation, from the fourth a formal contract
SMS & calls: Viettel international roaming can be activated free (text CVQT to 138); incoming SMS abroad is free

Pros

Stable once authenticated in your own name
Free roaming activation and free incoming SMS abroad (Viettel)

Watch out

Changing phones requires face re-authentication, hard to do from abroad
SIMs bought online in someone else’s name can be cut off at any time

Sources: luatvietnam.vn/linh-vuc-khac/dang-ky-thue-bao-di-dong-tu-15-4-2026-tat-tat-thong-tin-can-biet-883-108080-article.html · xaydungchinhsach.chinhphu.vn/quy-dinh-moi-ve-giay-to-su-dung-de-dang-ky-thong-tin-thue-bao-di-dong-mat-dat-119241227182059844.htm · zh.vietnamplus.vn/article-post259043.vnp · afamily.vn/hon-5-trieu-thue-bao-viettel-da-bi-chan-mot-chieu-236260615104955839.chn · www.facebook.com/vietteltelecom/posts/bay-%C4%91i-qu%E1%BB%91c-t%E1%BA%BF-tin-d%C3%B9ng-roaming-mi%E1%BB%85n-ph%C3%AD-%C4%91%C4%83ng-k%C3%BD-mi%E1%BB%85n-ph%C3%AD-nh%E1%BA%ADn-tin-nh%E1%BA%AFn-gi%C6%B0%CC%83-li%C3%AA/820664850087014

From user and blogger reports; platform risk rules change often — treat as a guide only. This section checked 2026-09-15.

Sign-up availability

What to expect when signing up for these services with a physical SIM from this country:

ChatGPT Works

Claude Works

WhatsApp Works

Telegram Works

LINE Works

WeChat Works

X Works

TikTok Works

Gemini Works

Jump to another country

Calling Vietnam from abroad

Dial +84, then the local number. Drop the leading trunk prefix 0. E.g. the landline 024 3123 4567 is dialled from abroad as +84 24 3123 4567.

Generate the full number →

Dialing within Vietnam

For domestic long distance dial 0 first, then the area code. Local calls and mobiles: dial directly.

Elsewhere in Asia

Community tips

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Common premise & disclaimer

Applies to every platform: VoIP / virtual numbers and heavily-reused number pools get rejected. Physical SIM only.

Checked 2026-09-12. Platform region policies and number-range allocations change — always confirm against each platform’s official supported-regions list and the carrier’s notices.

Sources：help.openai.com/articles/7947663 · www.anthropic.com/supported-countries · support.google.com/gemini?p=gemini_web_availability

Vietnam +84