B2B Phone Numbers in South Korea: Coverage and Calling Rules

B2B phone numbers in South Korea are easy to recognize and harder to use than in the US. Korean mobiles start with 010 (+82 10 from abroad), and Korea’s Network Act asks for the recipient’s explicit prior consent before you send commercial advertising by voice, including from outside Korea.

This page gives you the market size, the phone coverage to expect, number formats for your CRM, the consent and calling-hour rules with their official sources, how Korean buyers expect to be approached, and how to find the mobiles you are allowed to call.

Can you find and call B2B phone numbers in South Korea?

Yes, you can find B2B phone numbers in South Korea, but you should call them only with a legal basis: explicit prior consent, a recent purchase from you, or a request from the person. Korea’s Network Act treats a sales pitch by phone as commercial advertising, and its consent rule has no general exception for business recipients.

Finding the number is the easy half. Scalelist, an AI lead finder, returns Korean mobiles for the people you describe, at 20 credits per mobile found and nothing for a miss. Korea differs from the US in who you call: your own customers, people who asked you to call, and prospects who opted in or agreed to a call through an introduction.

How many B2B contacts can you reach in South Korea?

Scalelist’s Lead Finder matches over 3.1 million people profiles in South Korea, and over 390,000 of them are decision makers: owners, founders, CXOs, partners, VPs, heads and directors. Counts are from September 2026.

Korea is a focused market: size your exact segment before you plan call volume.

That makes B2B contact data in Korea a focused market: the smallest of the six markets in our mobile number coverage by country research. These are searchable profiles, not verified contacts, and some match on a past role. Size your own segment before you plan call volume. The count is free.

What phone coverage should you expect in South Korea?

In our 2026 provider benchmark, Scalelist found a phone number for 75% of an APAC founder list, the highest of the eight tools we tested. The next best was Prospeo at 44%; Apollo found 8%.

This is the region South Korea sits in; we have not published a Korea-only rate, so test your own list.

Three limits matter when you read this chart:

It is regional. The APAC list’s country mix is not published, so 75% is not a Korea rate. We have not published a Korea-only result.
It measures coverage. It counts how often a tool returned a phone number, not whether the number connected. The method and raw data are on our B2B data provider comparison.
It is our own test. Run yours: 100 real Korean prospects cost at most 2,100 credits in Scalelist (100 leads plus 20 credits per mobile found), and every miss is free.

South Korean phone number formats

A South Korean mobile number starts with 010 when dialed inside Korea and with +82 10 from abroad: you drop the leading 0 after the country code. Landlines use area codes instead: 2 for Seoul, two digits elsewhere, such as 31 for Gyeonggi province and 51 for Busan.

If a Korean number does not start +82 10, it rings a desk: sort those into a separate call block.

Mobile, dialed in Korea: 010-0000-0142 (a fictional example).
Same mobile, from the US: +82 10 0000 0142.
In your CRM or dialer: +821000000142. This is E.164, the ITU format: a plus sign, the country code and the number, with no spaces and no leading 0.
Old prefixes: Korea’s number unification policy moves the old 011, 016, 017, 018 and 019 mobile prefixes to 010, so expect 010 on current mobiles.

A number that starts +82 2 or +82 51 rings a desk. For why that matters for connect rates, see direct dial vs mobile vs switchboard.

Calling rules for B2B phone numbers in South Korea

South Korea regulates sales calls through two laws: the Act on Promotion of Information and Communications Network Utilization and Information Protection (the Network Act), which governs advertising by phone, text and email, and the Personal Information Protection Act (PIPA), which governs the contact data itself.

Article 50(1) of the Network Act says anyone who sends commercial advertising through an “electronic transmission medium” needs the recipient’s explicit prior consent. Article 2 defines that medium to include voice, and the official guide, published by KISA (the Korea Internet & Security Agency) and Korea’s communications regulator, lists landlines and mobiles.

The guide adds three points that matter for foreign B2B sellers:

Calls from abroad count. Article 5-2 applies the Act to acts outside Korea that affect Korean users.
Email is no workaround. Phone and fax became opt-in in 2004, and email joined them in 2014.
The live-call exception rarely fits B2B. The Act exempts a telephone seller who discloses, in a live voice and before the pitch, where they got the person’s data. The guide says this does not cover sales where a business buys for commercial purposes, which the Door-to-Door Sales Act excludes, so explicit prior consent applies.

The other exception is your own customers: if someone bought from you and you collected their number in that sale, you may advertise the same kind of product for 6 months after the transaction ends.

Calling hours and what to say on the call

Between 9 p.m. and 8 a.m. Korean time, you need separate prior consent on top of the first one (Article 50(3)). The guide measures that window at the recipient’s end, so it applies to calls from the US.

On every advertising call, say who you are and how to refuse (Article 50(4)). The guide suggests opening with “this call is an advertisement from [company]” and telling the person they can refuse directly to you. Stop as soon as they refuse, confirm the refusal within 14 days, and never generate numbers automatically (Article 50(5)).

Breaking Articles 50(1) to (3) carries an administrative fine of up to KRW 30 million (Article 76).

PIPA: be ready to say where you got the number

PIPA allows processing personal data with consent, or when it is necessary for your legitimate interest and clearly outweighs the person’s rights (Article 15). If you got the data from someone other than the person, such as a data provider, you must tell them the source, the purpose and their right to object when they ask (Article 20). Larger processors must tell them without being asked.

People can ask you to stop processing their data at any time (Article 37). The Personal Information Protection Commission (PIPC) enforces PIPA, with penalty surcharges of up to 3% of total revenue, and up to 10% for some repeated or intentional violations since September 2026 (Article 64-2).

The Do Not Call register

The Korea Fair Trade Commission runs a telephone solicitation Do Not Call register at donotcall.go.kr, under Article 42 of the Door-to-Door Sales Act. It protects consumers, and sellers covered by that Act must check it before they call. A B2B purchase for business use falls outside that Act, but a number on the register tells you the person does not want sales calls.

Most B2B cold calls to Korea fall in the last branch: build the relationship and the consent before you dial.

For the US, UK, EU and Australian rules side by side, see our guide to B2B cold calling laws.

How to approach Korean buyers by phone

Korean buyers expect a relationship before a pitch. The US Commercial Service guide to doing business in South Korea puts it bluntly: “cold calls are generally unacceptable and seen as culturally inappropriate and disrespectful.”

Get introduced. The Commercial Service’s market entry advice calls a strong business relationship critical and recommends a manufacturer’s representative, distributor or agent. A warm introduction is also your cleanest route to consent.
Speak Korean. Korean (Hangul) is the official business language. If you do not speak it, bring a Korean-speaking colleague or partner to the call.
Use the title and family name. Address people by title and surname, such as “Director Kim”. Korean names put the family name first.
Confirm by email after the call. Send what you promised the same day, to the address the person gave you.

When to call South Korea from the US

South Korea runs on Korea Standard Time (KST), UTC+9, set by the Standard Time Act on the 135th meridian east, and it has not used daylight saving time since 1988. Offices typically work 9 a.m. to 6 p.m., Monday to Friday.

Korea’s business morning is a US West Coast late afternoon, which makes it the natural team for Korean calls.

For a US team, Korea’s business morning falls in your evening. A rep in Los Angeles reaches 9 to 11 a.m. KST at 5 to 7 p.m. in summer, 4 to 6 p.m. in winter.

In New York the same window is 8 to 10 p.m. in summer and 7 to 9 p.m. in winter, and a 2 p.m. KST call lands around midnight. West Coast reps are the natural fit.

How to find Korean B2B mobiles in Scalelist

In Scalelist you describe the people you want in one sentence, see how many match for free, and pay only for the contact details it finds: 1 credit per lead, 1 per email, 20 per mobile, 0 for a miss.

Illustration: describe the buyer in plain English, check what Scalelist understood, and size the segment for free.

Describe your buyer in plain English in the Scalelist Lead Finder. For example: “Heads of procurement at shipbuilding and heavy machinery companies in South Korea with 500 to 5,000 employees.”
Check what it understood (title, industry, country, company size) and the match count before you spend anything.
Reveal mobiles only for people you may call: recent customers, people who asked you to call, and prospects who opted in or agreed to a call through an introduction.
Already have names? Upload them to the Mobile Finder, or follow our guide to phone number enrichment to add mobiles to an existing list or CRM.

Budget example: Dana Whitfield, VP of Sales at Northwind Fabrication in Columbus, Ohio, wants mobiles for 100 Korean procurement heads who agreed, through her distributor, to take her call. The worst case is 2,100 credits. At our APAC benchmark rate of 75%, she would pay about 1,600 credits: 100 for the leads and 1,500 for 75 mobiles. That fits the Scaler 2K plan at 89 USD a month.

Common challenges with B2B phone numbers in South Korea

The number rings a desk, not a mobile

Check the prefix before the list goes into your dialer: +82 10 is a mobile, +82 2 and other area codes are landlines. Put desk lines in a separate, lower-priority call block.

Do not call to pitch. Ask your distributor or partner to introduce you and to ask whether the person agrees to a call, or collect opt-ins at trade shows and on your website. Then call only the people who said yes.

Your team cannot cover Korean hours

Give Korea to your West Coast reps as a 5 to 7 p.m. block, or to a Korean-speaking partner. Never shift calls past 9 p.m. KST to suit your schedule.

Coverage looks thin for a small segment

With over 390,000 decision makers in the whole country, a narrow segment can run out fast. Widen the title list or the company size range, and compare mobile coverage with our UK business mobiles guide or the Australian B2B mobile numbers page if you sell across markets.

Best practices for calling South Korea

Record the legal basis per contact: consent (with date and wording), a purchase in the last 6 months, or the person’s request.
Open every call the same way: your name, your company, that it is a sales call, and that they can say no to you directly.
Keep one refusal list across phone, text and email, and confirm refusals within 14 days.
Know your source: note where each number came from so you can answer a PIPA request on the spot.
Call 9 a.m. to 6 p.m. KST, well inside the 8 a.m. to 9 p.m. window.
Store numbers in E.164 (+821000000142 for our fictional example) so your dialer and CRM treat Korean and US numbers the same way.

For the other markets in this series, see our pages on German B2B mobiles and Brazilian business mobiles. The full method for any country is in our playbook on finding business contact information, and the tactics that work for US numbers are in how to find direct dial phone numbers.

How Scalelist helps you reach Korean buyers

Scalelist finds and verifies contact details on demand rather than serving a pre-compiled list, so you can size a Korean segment, check its coverage and pay only for the mobiles it finds.

Size your Korean segment for free, then reveal mobiles only for the people you are allowed to call.

Describe your buyer in one sentence

FAQ

What is the format of a South Korean mobile number?

A South Korean mobile number starts with 010 and has 11 digits when dialed inside Korea, written 010-XXXX-XXXX. From abroad you drop the leading 0 and add the country code: +82 10 XXXX XXXX. In a CRM or dialer, store it in E.164 with no spaces: +8210 followed by 8 digits. Landlines use area codes such as 2 for Seoul.

Is cold calling legal in South Korea?

Not without a legal basis in most B2B cases. The Network Act requires explicit prior consent for commercial advertising by voice, and the official guide says the live-call exception does not cover sales to businesses buying for business use. Your own customers are exempt for 6 months after a purchase. This is not legal advice; confirm with Korean counsel.

Do Korean calling rules apply to a company calling from the US?

Yes, according to the Act and its official guide. Article 5-2 of the Network Act applies it to acts abroad that affect users in Korea, and the guide measures the 9 p.m. to 8 a.m. window in Korean time at the recipient’s end. A US team calling Korean buyers should follow the same consent, identification and refusal rules as a local one.

How many B2B phone numbers can I find in South Korea?

Scalelist’s Lead Finder matches over 3.1 million profiles in South Korea and over 390,000 decision makers at director level and above, as of September 2026. How many of them come back with a mobile depends on your segment. In our benchmark, Scalelist found a phone number for 75% of an APAC list; we have not published a Korea-only rate.

What time should I call South Korea from the US?

Call between 9 a.m. and 6 p.m. Korea Standard Time (UTC+9), the usual office hours. That is 5 to 7 p.m. in Los Angeles and 8 to 10 p.m. in New York for Korea’s morning, during US daylight time. Calls between 9 p.m. and 8 a.m. KST need separate prior consent under the Network Act.

Do I need to speak Korean to call Korean buyers?

It helps a great deal. The US Commercial Service lists Korean as the official and accepted business language, and cold calls are poorly received. Work with a Korean-speaking colleague or partner, address people by title and family name, and follow up in writing to the address they gave you.

What does it cost to find Korean mobile numbers with Scalelist?

20 credits per mobile found and nothing when no number is found. A lead from Lead Finder costs 1 credit and an email 1 credit, so a fully enriched contact costs at most 22 credits. Plans start at 29 USD a month for 500 credits, and new accounts get 20 free credits with no credit card required.

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