What is the dialing format for South Korean mobile numbers?

South Korean mobile numbers are written as 010-XXXX-XXXX or 011-XXXX-XXXX. When dialing from Vietnam, dial 00 82 10 XXXX XXXX (without the leading 0). The format is always 10 digits after the country code.

How much does it cost to call South Korea from Vietnam using Sayfone?

Sayfone charges 8¢/min for calls to South Korea from Vietnam. The rate applies to both mobile and landline numbers. Transparent pricing, connection charges, or signup wall—just transparent per-minute pricing.

What's the time difference between Vietnam and South Korea?

South Korea is 1 hour ahead of Vietnam year-round. Vietnam does not observe daylight saving time, and neither does South Korea, so the 1-hour offset is constant.

Can I call South Korean landlines and mobiles the same way?

Yes. Both landlines and mobile numbers use the international format +82 + area code (or mobile prefix) + number. The main difference is the prefix: landlines use 2–6 (area codes), and mobiles use 10–11.

Do I need an app or account to use Sayfone?

No. Sayfone is browser-based—just enter the number, review the rate, and call. No app download or prior registration is required to place your first call.

What should I do if the call doesn't connect?

First, verify the number format (00 82 + area code without leading 0 + local number). Check your internet connection. If the number is correct, the recipient's line may be busy. Try again or ask the contact to confirm their number via email.

Quick Answer

How to Call South Korea from Vietnam

Call South Korea from Vietnam by dialing +82 followed by the area code and local number. Use Sayfone for transparent 8¢/min rates with no app download.

Start calling

Cost tools

🇻🇳From Vietnam

To South Korea🇰🇷

$0.08

Per minute

+82

Country code

Call quality

Landline rate

$0.08/min

Mobile rate

$0.08/min

Same per-minute Sayfone rate for landline and mobile.

Average call quality

Steps at a glance

Dial +82 (South Korea country code)
Enter the area code (Seoul: 2, Busan: 51, Daegu: 53, etc.)
Dial the local 7–8 digit number
Call via Sayfone browser or enter a number to see the rate

DIALING INSTRUCTIONS

Step-by-Step: Calling South Korea from Vietnam

Follow these steps to dial a South Korean number from Vietnam. Each step includes an example so you can verify the format before dialing.

1
Step 1: Dial the international access prefix
From Vietnam, dial 00 to connect internationally. This tells your carrier you are making an international call.
```
00 (pause, then continue)
```
2
Step 2: Enter South Korea's country code
Dial 82, South Korea's country code. This directs your call to the South Korean telephone network.
```
00 82 (no plus sign when dialing manually; + is used for display only)
```
3
Step 3: Dial the area code
Enter the area code for the city you are calling. Omit the leading 0 if it is shown in the number. Seoul uses 2, Busan uses 51, Daegu uses 53, Incheon uses 32, and so on.
```
00 82 2 (for Seoul)
```
4
Step 4: Enter the local number
Dial the 7–8 digit local number. The total length of the area code plus local number is typically 9–10 digits.
```
00 82 2 1234 5678 (example Seoul landline)
```

Dialing format reference

+82

Use these patterns when entering a full international number to +82.

Mobile

+82 10-XXXX-XXXX (or 01X-XXXX-XXXX when dialing from Vietnam: 00 82 10 XXXX XXXX)

Landline

+82 2-XXXX-XXXX for Seoul (or 00 82 2 XXXX XXXX from Vietnam); other cities use different area codes

00 82 2 1234 5678 (Seoul landline)
00 82 51 123 4567 (Busan landline)
00 82 10 1234 5678 (mobile)

Major city area codes

Seoul2

Busan51

Daegu53

Incheon32

Daejeon42

Gwangju62

Ulsan52

Sources

DIALING RULES

Key South Korea Dialing Rules

These rules clarify South Korean phone numbering and help you avoid common dialing errors.

Omit the leading 0 from area codes when dialing internationally

South Korean numbers are often written with a leading 0 before the area code (e.g., 02 for Seoul). When calling from Vietnam, drop the leading 0 and dial +82 2 instead of +82 02.

Mobile numbers use 10-digit prefix

South Korean mobile numbers are written as 010-XXXX-XXXX or 011-XXXX-XXXX. When dialing internationally, use +82 10 XXXX XXXX or +82 11 XXXX XXXX (without the leading 0).

Landlines are 9–10 digits total

A Seoul landline such as 02-1234-5678 becomes +82 2 1234 5678 when dialed internationally. Always verify the format with your contact before calling.

Vietnam's international access code is 00

From Vietnam, you must dial 00 as the international access code. Some countries use +, but +82 is a notation; when dialing manually from Vietnam, use 00 82.

TIMING & ETIQUETTE

Best Times to Call South Korea from Vietnam

South Korea is 1 hour ahead of Vietnam year-round. Plan your calls during business hours (9 AM–6 PM Korea Standard Time) or early evening for better connection rates.

🇰🇷

Vietnam and South Korea both observe standard time without daylight saving, so the 1-hour offset is consistent throughout the year.

Time & windows

Morning (South Korea)

9 AM–12 PM KST

8 AM–11 AM VNT — ideal for business calls

Afternoon (South Korea)

1 PM–6 PM KST

12 PM–5 PM VNT — best for general availability

Evening (South Korea)

6 PM–9 PM KST

5 PM–8 PM VNT — for casual or personal calls

🇻🇳Vietnam 12 PM (noon)

South Korea 1 PMMid-lunch in Korea; good for brief calls

🇻🇳Vietnam 3 PM

South Korea 4 PMLate afternoon in Korea; optimal for business

🇻🇳Vietnam 9 PM

South Korea 10 PMEvening in Korea; avoid unless urgent

Calling tips

Call during South Korean business hours (9 AM–6 PM KST) for professional contacts.
Weekends in Korea run Saturday–Sunday; avoid calling businesses on Friday evening.
South Korea observes major holidays (Lunar New Year, Chuseok); check dates before calling.
Mobile numbers in Korea are generally available 24/7, but respect quiet hours (late night/early morning).
Keep calls brief during initial contact to allow the recipient to find a quiet space.

Business etiquette

Use formal titles and honorifics (Mr., Mrs., Director) until invited otherwise.
Open calls with a brief self-introduction and the purpose of your call.
Allow time for translation if your contact is not fluent in English.
Confirm callback numbers and time zones to avoid missed connections.
Follow up important calls with a brief email summarizing key points.

TROUBLESHOOTING

Common Calling Issues & Solutions

If your call doesn't go through, check these common issues. Most problems are easily resolved by verifying your number format or connection method.

Call doesn't connect

Verify the number format: dial 00 82 (country code) + area code (drop the leading 0) + local number. Check your internet connection if using a browser dialer. If the number is correct, the recipient's line may be busy or offline.

Poor audio quality

Move to a location with stronger Wi-Fi or mobile signal. South Korean carriers maintain modern networks, so poor quality usually indicates the caller's connection. Test your internet speed before placing long calls.

High call costs

If calling via Sayfone, your rate is shown before dialing. Standard carrier rates (outside of Sayfone) can be 2–3 times higher. Check your telecom plan for international calling packages. Browser-based calling via Sayfone avoids roaming charges.

Calls to business numbers fail

Some business lines may not accept international calls due to their PBX settings. Try a mobile number, contact the business via email first to confirm their number, or use a callback service.

Savings

See what you could save

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