What is a country calling code?

A country calling code is the numeric prefix you dial before a national phone number to route a call to a specific country. For example, +1 reaches the United States and Canada, +44 reaches the United Kingdom, and +91 reaches India. The plus sign stands in for the international access code your network uses.

How do I dial an international number correctly?

Start with your exit or access code (or the + symbol on a mobile), add the destination country code, then the area or city code without its leading zero, and finally the local subscriber number. So a London line looks like +44 20 7946 0000.

What does the plus (+) sign mean in a phone number?

The + is a universal placeholder for the international dialing prefix. Saving numbers in +country-code format means they connect from any country without editing the access code, which is why it is the recommended way to store contacts.

Why do the United States and Canada share the country code +1?

Both countries belong to the North American Numbering Plan, a shared system that also covers several Caribbean nations. They use the same +1 country code but are separated by distinct three-digit area codes.

Do I need to remove the leading zero from a phone number when calling internationally?

Usually yes. Many countries print a trunk prefix, often a 0, for domestic calls. When dialing from abroad you drop that leading zero after the country code. For example, a UK mobile written as 07700 900000 becomes +44 7700 900000.

How do I correctly format Vietnamese phone numbers in letsdial?

Vietnam's country code is +84. Hanoi uses area code 24 (reformed in 2018 from the old 4), and Ho Chi Minh City uses 28 (reformed from 8). Mobile numbers use 03x, 07x, 08x, and 09x ranges — for example, 032, 038, 086, 096. Domestically these start with 0; in letsdial, replace the leading 0 with +84. So +84 24 XXXX XXXX for a Hanoi landline and +84 86 XXX XXXX for a Viettel mobile.

What time zone does Vietnam use, and does it observe DST?

Vietnam observes Indochina Time (ICT, UTC+7) with no daylight saving adjustments, the same as Thailand and Cambodia. The permanent UTC+7 offset makes letsdial call scheduling with Vietnamese contacts straightforward year-round. For Australian East Coast callers (AEST, UTC+10), Vietnam is 3 hours behind — a convenient overlap. For US East Coast callers, Vietnam is 12 hours ahead.

What are the reformed area codes for Hanoi and Ho Chi Minh City that I should use in letsdial?

Vietnam reformed its telephone numbering in November 2018. Hanoi's area code changed from 4 to 24, and Ho Chi Minh City's changed from 8 to 28. Some older references still list the pre-2018 codes, but in letsdial you must use the current codes: +84 24 for Hanoi and +84 28 for Ho Chi Minh City. Using the old codes will result in failed connections.

Can letsdial provide a Vietnamese virtual number for businesses targeting Vietnam's growing economy?

Yes, letsdial offers Vietnamese virtual numbers with Hanoi (24) and Ho Chi Minh City (28) area codes. Vietnam is one of Southeast Asia's fastest-growing economies, with a booming manufacturing, tech, and consumer goods sector attracting significant foreign direct investment. A letsdial Vietnamese virtual number allows international businesses to receive inbound calls at local rates and build trust with Vietnamese partners who strongly prefer calling local numbers.

What business culture considerations should guide my letsdial calls with Vietnamese counterparts?

Vietnamese business culture values hierarchy, collective decision-making, and relationship (quan he) before commercial transaction. Decisions are rarely made by a single individual in a first call — expect multiple stakeholders and a longer relationship-building process. Begin letsdial calls with respectful greetings, use formal titles, and avoid pushing for commitments too quickly. Following up with a Zalo message summarizing the discussion after each call is good practice and signals professionalism.

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Vietnam

+84

Country code

International prefix

Vietnam's country code +84 connects one of Asia's fastest-growing economies. Ho Chi Minh City and Hanoi are rapidly emerging as major tech and manufacturing hubs.

Best hours:9 AM – 6 PM ICT

Language:Vietnamese

Capital:Hanoi

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🇻🇳

Vietnam

VN · Asia

+84

dial code

Capital

Hanoi

Currency

VND (₫)

Language

Vietnamese

Population

97 million

Best calling window

9 AM – 6 PM ICT

12 AM

12 PM

11 PM

Indochina Time (ICT) · UTC+7

Country

Vietnam

2 Digit ISO

Country Calling Code

+84

ISO Alpha-3

VNV

Loading map…

Hanoi

Capital

Live

Hanoi

--:--:-- --

Time Zone

Indochina Time (ICT)

Quick Facts

CurrencyVND (₫)

LanguageVietnamese

Population97 million

GMT OffsetUTC+7

Best Hours9 AM – 6 PM ICT

Step by step

How to call Vietnam from abroad

International dialing is a four-step process.
Use + on mobile to skip the exit code entirely.

Step 01

Exit code

Dial from US/Canada (or use +)

Step 02

+84

Country code

Vietnam international prefix

Step 03

Area / city code

Local routing prefix

Step 04

1234 5678

Local number

Subscriber number

dialing-example.txt

International format

00—84—24—1234 5678

Shorthand (works from any device): +84 24 1234 5678

Calling Guide

Best time to call Vietnam · Indochina Time (ICT)

View guide

Why letsdial

Benefits of calling Vietnam
with letsdial

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Get a local +84 number

A Hanoi +84 24 or Ho Chi Minh City +84 28 caller ID signals a Vietnamese business presence — essential in a fast-growing economy where Zalo is the dominant local platform.

Vietnam and 50+ countries, one plan

Call Vietnam and 50+ global markets from one letsdial subscription — no per-city fees for Hanoi, Ho Chi Minh City, Da Nang, or Haiphong.

Full call analytics

Track every Vietnam call in ICT (UTC+7) — monitor answer rates, peak business hours, and team performance in one real-time dashboard.

Works on any device

Mobile app, desktop, or IP phone — your +84 number lets your team reach Vietnamese contacts from any device and any country.

Unified Communications

One platform. Every call, message and team — connected.

One cloud platform replaces your phone system, chat tool, and contact centre — no hardware, no juggling apps.
Reach Vietnam and 50+ countries from one dashboard.

50+

Countries covered

99.9%

Uptime SLA

2 min

Setup time

Hardware needed

Voice & Video Calls

Crystal-clear HD calls to Vietnam and 50+ countries from one number.

Team Messaging

Chat, share files, and collaborate — all inside the same platform you call from.

Real-Time Analytics

Live dashboards for call volumes, answer rates, and agent performance.

Global Number Coverage

Local +84 numbers plus 50+ country codes — managed from one dashboard.

Format reference

Vietnam& neighbouring countries

Vietnamese numbers under +84 use 2-digit city codes — Hanoi (24), Ho Chi Minh City (28). Always drop the leading 0. Mobile numbers use 03x/07x/08x/09x: +84 9x xxx xxxx.

CountryLocal formatInternational format

Vietnamcurrent1234 5678+84 24 1234 5678

Thailand123 4567+66 2 123 4567

Malaysia1234 5678+60 3 1234 5678

Indonesia1234 5678+62 21 1234 5678

Singapore6789 1234+65 6789 1234

China1234 5678+86 10 1234 5678

Good to know

Tips for calling Vietnam

4 things to check before you dial internationally

Vietnamese area codes: drop the leading 0 from abroad

Vietnamese area codes start with 0 domestically (024 Hanoi, 028 Ho Chi Minh City) — drop that 0 when dialling from abroad: +84 24 for Hanoi, +84 28 for HCMC. Mobiles use 03x/07x/08x/09x: +84 9x xxx xxxx.

Zalo is Vietnam's dominant local business platform

Zalo is the most widely used messaging app in Vietnam — the local equivalent of WhatsApp or LINE. Most Vietnamese professionals use Zalo for daily communication. Reach out via Zalo before calling for domestic contacts.

Show a local +84 caller ID

Vietnamese contacts are unlikely to answer calls from unknown international numbers. A letsdial +84 24 (Hanoi) or +84 28 (Ho Chi Minh City) caller ID signals a Vietnamese business presence and substantially improves answer rates.

ICT is UTC+7 — no daylight saving

Indochina Time never changes. Vietnamese business hours are 8 AM–5 PM ICT, Monday to Friday. From London (GMT), Vietnam is 7 hours ahead; from New York (ET), 12 hours in winter.

Market data

Vietnam communication insights

79%

Internet penetration

73% of Vietnam's population uses the internet, with mobile broadband the primary access method.

95%

Mobile users

96% of Vietnamese residents use mobile phones, supporting one of the most active mobile markets in the region.

68%

Smartphone owners

60% of Vietnamese adults own smartphones; Zalo is the leading local app for business and consumer messaging.

75%

Digital businesses

65% of Vietnamese businesses have adopted digital communication platforms for operations and customer outreach.

Global directory

List of Country Codes

50+ countries listed with their international dial prefix and ISO code.

Filter by letter or search to find any country code instantly.

Vietnam calling FAQs

Frequently asked about Vietnam

Zalo is Vietnam's most popular domestic messaging platform, built by Vietnamese company VNG, and has surpassed even Facebook Messenger in daily active users within Vietnam. Unlike WeChat in China, Zalo operates alongside (not instead of) Facebook Messenger, but for business-to-Vietnamese-consumer communication, Zalo is the primary channel. A Zalo message before your letsdial call dramatically increases the likelihood of your call being answered.

Get a local Vietnam number

Get a local Vietnam number in minutes.

Build trust with Vietnam customers using a local +84 virtual phone number — from the same letsdial dashboard your whole team already uses.

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Looking up US area codes? Browse all US area codes →

Vietnam

Vietnam

How to call Vietnam from abroad

Benefits of calling Vietnamwith letsdial

Get a local +84 number

Vietnam and 50+ countries, one plan

Full call analytics

Works on any device

One platform. Every call, message and team — connected.

Vietnam& neighbouring countries

Tips for calling Vietnam

Vietnamese area codes: drop the leading 0 from abroad

Zalo is Vietnam's dominant local business platform

Show a local +84 caller ID

ICT is UTC+7 — no daylight saving

Vietnam communication insights

List of Country Codes

Frequently asked about Vietnam

Get a local Vietnam number in minutes.

Benefits of calling Vietnam
with letsdial