What is the cost to call Japan from Vietnam on Sayfone?

Sayfone charges 36¢ per minute to call Japan from Vietnam. Transparent per-minute pricing or signup required—pay only for the minutes you use at transparent per-minute rates.

Do I need an app to call Japan from Vietnam?

No. Sayfone is browser-based, so you can call from your web browser on any device. No app download is necessary.

Can I call Japanese toll-free or emergency numbers?

Toll-free numbers (starting with 0120 or 0570) and emergency numbers (like 110 for police) may not be reachable from abroad through Sayfone. Try regular landline or mobile numbers instead.

What is the best time to call Japan from Vietnam?

Japan is 8 hours ahead of Vietnam. Business hours in Japan are 9:00 AM–6:00 PM JST, which corresponds to 1:00 AM–10:00 AM Vietnam time. Early morning Vietnam time is best for reaching Japanese businesses.

Is the call quality the same for mobile and landline numbers?

Call quality depends on your internet connection and the recipient's network, not whether the number is mobile or landline. Both connect reliably using the same dialing format.

Quick Answer

How to Call Japan from Vietnam

To call Japan from Vietnam, dial 00 (or +) + 81 + the area code (without leading 0) + the local number. Calls are typically clear and connect quickly.

Start calling

Cost tools

🇻🇳From Vietnam

To Japan🇯🇵

$0.36

Per minute

+81

Country code

Call quality

Landline rate

$0.36/min

Mobile rate

$0.36/min

Same per-minute Sayfone rate for landline and mobile.

Average call quality

Steps at a glance

Dial 00 (international access code)
Enter 81 (Japan country code)
Add the area code (without the 0)
Dial the local number

Sources

1
ITU Country Code List

STEP-BY-STEP

Dialing Steps

Follow these steps to place a call from Vietnam to Japan using Sayfone or any international dialing method.

1
Dial the international access code
From Vietnam, dial 00 to exit the country. Some phones allow + (plus) instead. Both methods work the same way.
```
00 or +
```
2
Enter Japan's country code
Japan's country code is 81. This tells the network you are calling Japan.
```
81
```
3
Dial the area code (without the leading 0)
Japanese area codes start with 0 domestically. When calling internationally, drop the leading 0. For example, Tokyo's area code is 3 (domestic: 03).
```
3 (for Tokyo), not 03
```
4
Dial the local number
Enter the subscriber's full local number after the area code.
```
XXXX-XXXX (typically 7–8 digits depending on the city)
```

Dialing format reference

+81

Use these patterns when entering a full international number to +81.

Mobile

+81 90-XXXX-XXXX or +81 70-XXXX-XXXX

Landline

+81 [area code]-[local number] (e.g., +81 3-XXXX-XXXX for Tokyo)

+81 3-1234-5678 (Tokyo landline)
+81 90-1234-5678 (Mobile)
+81 6-1234-5678 (Osaka landline)

Major city area codes

Tokyo3

Osaka6

Kyoto75

Yokohama45

Sapporo11

Sources

1
Japan Numbering Plan - Ministry of Internal Affairs and Communications

KNOW THE RULES

Japan Dialing Rules & Formats

Japan uses a standardized numbering plan. Understanding these formats ensures your call connects reliably.

Always drop the leading 0 from area codes

When calling Japan from abroad, remove the leading 0 from area codes. Domestically, Tokyo is 03; internationally, use 3.

Mobile numbers use 70, 80, or 90 prefixes

Japanese mobile phones start with 070, 080, or 090. When dialing internationally, dial the full prefix (including the first 0 is already removed in the full number format).

Total number length is typically 10 digits

After the country code +81, most Japanese numbers are 9 digits (area code + local number or mobile prefix + number).

Landlines and mobile numbers are dialed the same way

Use the dialing format above for both; the network automatically routes the call to the correct number type.

TIMING & TIPS

Best Times to Call Japan from Vietnam

Japan is 8 hours ahead of Vietnam. Plan calls during business hours or early morning to reach people when they are available.

Time & windows

Vietnam Morning

6:00 AM – 12:00 PM VT

Japan Early Afternoon to Evening (2:00 PM – 8:00 PM JST)

Vietnam Afternoon

12:00 PM – 6:00 PM VT

Japan Evening to Late Night (8:00 PM – 2:00 AM JST)

Vietnam Evening

6:00 PM – 12:00 AM VT

Japan Late Night to Morning (2:00 AM – 8:00 AM JST)

🇻🇳Business hours (Japan)

9:00 AM – 6:00 PM JST (1:00 AM – 10:00 AM VT)Best for reaching offices and services

🇻🇳Lunch break (Japan)

12:00 PM – 1:00 PM JST (4:00 AM – 5:00 AM VT)Many offices are closed

🇻🇳Evening social time (Japan)

6:00 PM – 9:00 PM JST (10:00 AM – 1:00 PM VT)Good for personal calls

Calling tips

Japan does not observe daylight saving time, so the 8-hour difference is consistent year-round.
Avoid calling between midnight and 6:00 AM Japan time unless agreed in advance.
Weekends in Japan are Saturday and Sunday; plan business calls for weekdays.
Holidays in Japan include New Year (Jan 1), Golden Week (late April–early May), and Obon (August 13–15).

Business etiquette

Use honorific language (keigo) when calling business contacts; start with a formal greeting.
Introduce yourself with your company name and position before stating your purpose.
If calling a large company, ask to be transferred to the correct department; many have dedicated phone lines.
Return calls promptly; punctuality is highly valued in Japanese business culture.

Sources

1
Time and Date - World Time Zones

TROUBLESHOOTING

Common Issues & Solutions

Most calls connect without issues. Here's how to resolve problems if they occur.

Call does not connect

Check that you dialed 00 81 (or +81) followed by the area code without the leading 0 and the full local number. Verify the number with your contact if unsure. Internet connection must be stable.

Call keeps dropping

A weak internet connection is the most common cause. Move closer to your Wi-Fi router or switch to mobile data if available. Try again after a few minutes.

No dial tone or immediate disconnect

The number format may be incorrect. Double-check the area code (without leading 0) and local number. Some special service numbers may not accept international calls.

Poor call quality or echo

Network congestion can affect clarity. Try calling at a different time, or ask your contact to call you back. Switching between Wi-Fi and mobile data may also help.

Savings

See what you could save

Adjust the tools below to compare Sayfone with typical retail pricing for calls to Japan. 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 Japan — 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.