What is the dialing code for Vietnam?

Vietnam's country code is +84. When calling from Japan, dial 010 (international access code) + 84 (country code) + area code + local number.

Do I need to include the area code when calling a Vietnam mobile number?

No. Vietnam mobile numbers do not use area codes; they begin with 9 and are 10 digits long after the country code. For example: +84 912345678. Landlines require an area code.

How much does it cost to call Vietnam from Japan?

Sayfone offers transparent per-minute rates for calls to Vietnam. Rates vary based on call type (landline or mobile); check your account for the current rate before placing calls.

Can I call Vietnam landlines and mobiles the same way?

Mostly, yes. Both require the country code +84. Landlines require an area code (24, 28, etc.); mobile numbers do not and typically start with 9. Both are dialed the same way from Japan once formatted correctly.

What time should I call to reach someone in Vietnam?

Vietnam is 8 hours behind Japan. If it's 6:00 PM in Japan, it's 10:00 AM in Vietnam. Best times are 4:00 PM–8:00 PM Japan time, which corresponds to 8:00 AM–12:00 PM Vietnam time.

What happens if I dial the number wrong?

If you omit the area code on a landline, the call will fail. If you include the leading 0 (from a domestic Vietnam number), drop it when dialing from Japan and replace it with +84. Always verify the complete number before dialing.

Can I call Vietnam emergency services from Japan?

No. Vietnam emergency numbers (113 for police, 114 for fire) do not work internationally. For emergencies, contact your local Japanese emergency services or the Vietnam embassy in Japan.

Is there a time difference to consider for daylight saving?

Japan does not observe daylight saving time. Vietnam also does not observe daylight saving time. The 8-hour time difference (Japan ahead) remains constant year-round.

Quick Start

How to Call Vietnam from Japan

To call Vietnam from Japan, dial 010 (Japan's international prefix), then +84 (Vietnam's country code), the area code, and the local number.

Start calling

Cost tools

🇯🇵From Japan

To Vietnam🇻🇳

$0.22

Per minute

+84

Country code

Call quality

Landline rate

$0.22/min

Mobile rate

$0.22/min

Same per-minute Sayfone rate for landline and mobile.

Average call quality

Steps at a glance

Dial 010 (Japan international exit code)
Enter +84 (Vietnam country code)
Add the area code (Hanoi: 24, Ho Chi Minh City: 28)
Dial the local subscriber number

Sources

1
Vietnam country calling code
International Telecommunication Union official country code reference

DIALING STEPS

Step-by-Step: Calling Vietnam from Japan

Follow these steps to reach a Vietnam landline or mobile number from Japan.

1
Dial Japan's international access code
Start by dialing 010, Japan's international dialing prefix. This signals your phone to connect internationally.
```
010
```
2
Enter Vietnam's country code
Dial +84, Vietnam's country code. You may see this written as 0084 on some systems, but +84 is standard.
```
010 + 84
```
3
Add the area code
Enter the area code for your destination city. For Hanoi landlines, use 24; for Ho Chi Minh City landlines, use 28. Mobile numbers may begin with 9xx.
```
010 + 84 + 24 (Hanoi)
```
4
Dial the local number
Enter the remaining subscriber number. Hanoi landlines typically have 8 digits after the area code; mobile numbers are usually 10 digits total after the country code.
```
010 + 84 + 24 + 1234567 = 010-84-24-1234567
```

Dialing format reference

+84

Use these patterns when entering a full international number to +84.

Mobile

+84 9XX XXXXXXX (10 digits after country code)

Landline

+84 [area code] XXXXXXXX (8–10 digits after area code)

+84 24 1234567 (Hanoi landline)
+84 28 2345678 (Ho Chi Minh City landline)
+84 912345678 (Mobile)

Major city area codes

Hanoi24

Ho Chi Minh City28

Da Nang236

Hai Phong225

Sources

1
Vietnam numbering plan
For numbering format reference

RULES & FORMATS

Vietnam Dialing Rules & Number Formats

Understand Vietnam's numbering structure, area code rules, and special formatting requirements when calling from Japan.

Landline area codes are mandatory

When calling a Vietnam landline from Japan, you must include the area code. Omitting it will result in a failed call. Area codes range from 2–3 digits.

Mobile numbers include a carrier prefix

Vietnam mobile numbers begin with 9 (or sometimes 3 or 8) followed by 8 digits. Examples: 0912345678 (domestic), +84912345678 (international). When dialing internationally, drop the leading 0 from the mobile number.

Drop the leading 0 for international calls

Domestic Vietnam numbers often start with 0. When dialing from Japan, omit this 0 and replace it with the country code +84.

Total digit count after country code

After +84, expect 8–10 digits depending on whether you are calling a landline (area code + subscriber number) or a mobile (10 digits total).

TIMING & TIPS

Best Times to Call Vietnam from Japan

Vietnam is 8 hours behind Japan (Japan is UTC+9, Vietnam is UTC+7). Plan your calls to reach contacts during local business or personal hours.

Time & windows

Morning in Vietnam

8:00 AM – 12:00 PM VT

4:00 PM – 8:00 PM Japan time (good for evening calls from Japan)

Afternoon in Vietnam

1:00 PM – 5:00 PM VT

9:00 PM – 1:00 AM Japan time (late evening/night in Japan)

Evening in Vietnam

6:00 PM – 10:00 PM VT

2:00 AM – 6:00 AM Japan time (early morning in Japan)

🇯🇵9:00 AM Vietnam time

5:00 PM Japan timeStandard business hours in Vietnam; early evening in Japan

🇯🇵12:00 PM Vietnam time

8:00 PM Japan timeLunch break in Vietnam; reasonable evening call time in Japan

🇯🇵2:00 PM Vietnam time

10:00 PM Japan timeAfternoon in Vietnam; late evening in Japan

🇯🇵6:00 PM Vietnam time

2:00 AM Japan timeEnd of business day in Vietnam; very early morning in Japan

Calling tips

Call between 4:00 PM and 8:00 PM Japan time to reach Vietnam during their business hours (8:00 AM–12:00 PM).
Avoid early morning calls from Japan (before 10:00 AM) unless your contact in Vietnam is expecting a call late evening.
Weekdays (Monday–Friday) are best for business calls; personal calls can be made evenings in Japan (6:00 PM–10:00 PM Japan time).
Check if your contact observes Vietnam national holidays; major holidays include Tet (Lunar New Year), Independence Day (September 2), and Christmas is less observed.

Business etiquette

Vietnamese business culture values direct but respectful communication; be concise and professional.
Initial formality is important; use titles and family names until invited to use first names.
Building relationships (trust) often precedes transactions; allowing time for rapport-building calls is common.
Avoid calling very late evening or early morning Vietnam time unless an emergency or pre-arranged appointment.

Sources

1
IANA Time Zone Database
Authoritative source for time zone offsets

TROUBLESHOOTING

Common Calling Issues & Restrictions

Resolve connection problems, number-format errors, and understand limitations when calling Vietnam from Japan.

Call fails or won't connect

Check that you dialed 010 (Japan's exit code) first, then +84 (Vietnam country code), then the complete area code and number. Verify the number is a valid Vietnam landline or mobile format. If using a land phone, ensure international calling is enabled on your account.

Reached the wrong number or disconnected

Vietnam's area codes vary by region; confirm you used the correct code (24 for Hanoi, 28 for Ho Chi Minh City, etc.). If dialing a mobile, ensure it starts with 9 and has 10 digits total after the country code.

Poor sound quality or echo

International calls can sometimes experience latency or echo. Try calling again at a different time, or ask your contact to reduce background noise. Using a headset or speaker phone may improve clarity.

Special numbers may not work internationally

Some Vietnam numbers—such as emergency services (113, 114), toll-free lines, or premium services—may not connect from Japan. Verify the number is a standard residential or business landline or mobile.

Savings

See what you could save

Adjust the tools below to compare Sayfone with typical retail pricing for calls to Vietnam. Start with one call, then layer on monthly volume to see the bigger picture.

How to use these tools

Sayfone uses your live rate for calls to Vietnam — the same basis as the rest of this page.
First, estimate savings on a single call length. Then, model a full month of minutes versus typical retail benchmarks.
Retail competitor rows are illustrative — not a quote from any carrier.