South Korea – Landlines and Mobile Phones

What are the international dialling codes for South Korea, and what are the area codes for the most popular expat destinations?

South Korea’s assigned country code is +82. To place a call to South Korea from another country, you enter your international dialling prefix (commonly 00, or simply + on a mobile handset), followed by 82 and then the local number. One important rule: the leading “0” that appears on area codes and mobile numbers within Korea must be omitted when you add +82. Calls made domestically, however, always retain that leading zero. As a practical illustration, a Seoul number displayed locally as 02-1234-5678 would be entered as +82-2-1234-5678 when dialled from overseas.

The capital, Seoul, is identified by the two-digit area code 02, whereas other major cities — including Busan and Daegu — use three-digit codes such as 051 and 053 respectively. The table below lists area codes for cities frequently chosen by expatriates:

Korean mobile numbers are instantly recognisable by the nationwide 010 prefix. When dialling a Korean mobile from abroad using the +82 country code, remember to strip the leading zero — so 010 becomes 10. This rule applies consistently to both landline area codes and mobile prefixes alike.

Freephone numbers in South Korea commonly begin with 080 or 1588 and are used extensively by businesses and government agencies to handle customer enquiries. It is worth noting that certain number ranges — including 1566, 1577, and 1588 — may be unreachable from international lines. If you need to contact a Korean service provider from outside the country, check the provider’s official website for an internationally accessible number before attempting to call.

Who are the major landline providers in South Korea, and how can you contact them?

Fixed-line telephone services in South Korea are provided by three principal operators: KT Corporation, SK Broadband, and LG Uplus. Each company competes across the full range of telecommunications services — mobile, landline, and broadband internet — meaning that for most newcomers, the choice of landline provider tends to be made alongside the selection of a home broadband package, as all three operators promote combined deals.

KT Corporation is the oldest telecommunications company in South Korea and holds the largest share of the fixed-line and broadband market, serving around 90 percent of the country’s landline subscribers. As the direct successor to the former state telephone monopoly, KT has built the most extensive physical infrastructure and remains the default option in the majority of residential areas. KT can be reached via its website at www.kt.com, or by dialling 100 from a KT line (alternatively, 02-2190-0114 from any other phone).

SK Broadband serves as the fixed-line and internet division of the SK Group and operates as an affiliate of SK Telecom. It delivers residential and business landline services together with fibre broadband connectivity. You can contact SK Broadband at www.skbroadband.com or by calling 106 from an SK line. LG Uplus completes the trio, distinguishing itself through attractive bundled home packages that combine voice telephony, broadband internet, and IPTV. Visit www.uplus.co.kr or dial 101 to reach their customer service team.

Landline pricing depends on the plan and bundle chosen, and tariffs are subject to change. As of 2024, basic monthly line rental fees typically begin at a few thousand Korean won, with call charges varying according to the selected plan. It is always advisable to check each provider’s official website or speak with staff at a service centre for up-to-date pricing, since promotional offers and bundled discounts can considerably alter the overall cost.

Should you encounter issues or wish to raise a regulatory concern regarding your fixed-line service, the body responsible for overseeing telecommunications in South Korea is the Ministry of Science and ICT (MSIT). Consumer disputes may also be referred to the Korea Communications Commission (KCC), which functions as the national telecommunications regulator and is responsible for protecting consumers in the sector.

Who are the major mobile phone providers in South Korea, and how can you contact them?

Mobile phone services in South Korea are dominated by SK Telecom, KT Corporation, and LG U+. Data from 2023 indicates that slightly more than 48 percent of all mobile subscribers in the country are connected through SK Telecom. Alongside these three established carriers, Mobile Virtual Network Operators (MVNOs) have been steadily gaining traction as an alternative, particularly among budget-conscious users.

All three major networks have invested substantially in their 4G and 5G infrastructure, meaning strong signal strength is available to virtually everyone across the country, from large metropolitan areas to smaller towns. That said, meaningful differences between the carriers do exist. SK Telecom’s network is the broadest in geographic reach, making it the preferred choice for anyone who travels frequently to rural or isolated locations. KT, as the country’s longest-established carrier, also delivers solid coverage across countryside and mountainous terrain.

When it comes to English-language customer support — whether in-store, via phone, or online — KT and LG U+ are generally considered more accessible to non-Korean speakers. SK Telecom, however, runs dedicated foreigner assistance at more than 30 of its T World retail locations, and multilingual support in English, Chinese, Russian, and Vietnamese is available in major cities including Seoul, Busan, Daegu, and Gwangju.

As of 2024, entry-level postpaid plans begin at roughly 30,000 to 40,000 KRW per month and typically include under 3GB of data. The majority of subscribers choose plans priced between 50,000 and 70,000 KRW offering at least 5GB. Unlimited data postpaid plans are available at around 80,000 to 100,000 KRW monthly. Always confirm current pricing directly with the operator, as rates and promotional offers are subject to frequent revision. For those seeking flexibility or lower costs, MVNOs provide prepaid options built on the infrastructure of the main carriers — these are often the most economical choice for short-term visitors or anyone who prefers to avoid a binding contract.

How do I get a landline connected in South Korea?

Arranging a landline connection in South Korea is a manageable process. KT handles the overwhelming majority of residential fixed-line installations, though SK Broadband and LG Uplus are viable alternatives in most urban and suburban locations. Whether you are renting or own your home does not fundamentally alter the procedure, though your landlord may need to be consulted if new cabling or hardware is required in an older building.

1. Choose your provider. Review the bundled landline and internet packages offered by KT (www.kt.com), SK Broadband (www.skbroadband.com), and LG Uplus (www.uplus.co.kr). In many apartment blocks, the building has already been wired for a particular provider, which can effectively narrow down your options from the outset.
2. Gather your documents. You will generally need a valid passport, evidence of your Korean address (a lease agreement or utility bill will usually suffice), and — for those residing in Korea long-term — your Alien Registration Card (ARC). If you hold a Korean bank account, keep those details to hand for establishing a direct debit payment arrangement.
3. Apply online, by telephone, or in person. All three major providers accept applications through their websites (some sections of which are available in English), via their customer service telephone lines, or at a physical service centre. If your Korean language ability is limited, attending a store in person tends to be the most practical approach, as staff can guide you through the paperwork.
4. Arrange an installation appointment. A technician will visit your address to connect the line and fit any required equipment, such as a router or telephone handset. Waiting times are generally short — commonly within two to five working days of your application being approved, though this can fluctuate. Confirm the current timeframe with your chosen provider when you apply.
5. Receive and activate your service. Once the installation is complete, you will be provided with your line number and account information. Test the line immediately and request a billing statement — whether paper or digital — so you have a clear picture of your billing cycle and the payment method in use.

Security deposits are not routinely required for landline connections in South Korea, but providers may carry out a credit or identity check as part of the postpaid application process. If you have only recently arrived and your ARC has not yet been issued, you may be asked to pay a deposit or to opt for a prepaid arrangement in the interim. Requirements differ between providers, so it is worth confirming the specifics with whichever company you choose. For up-to-date guidance on consumer rights, refer to the Korea Communications Commission (KCC).

How do I get a mobile phone SIM card or contract in South Korea?

Newcomers to South Korea have two primary routes to mobile connectivity: prepaid SIM cards and postpaid contracts. The documentation you need depends on the length of your stay and your residency status. Unlike some countries where SIM cards can be picked up with little more than a name, South Korea mandates identity verification for every purchase — tourist SIMs included.

Long-term residents — those spending 90 days or more in the country — are required to present an Alien Registration Card (ARC), while short-term visitors (under 90 days) can typically register using their passport and visa alone. Postpaid contracts additionally require a Korean bank account to facilitate automatic monthly payment.

Follow these steps to get connected:

1. Decide between prepaid and postpaid. If you have just arrived and have not yet received your ARC, a prepaid SIM is the quickest path to obtaining a local number. MVNO providers offer prepaid options that run on the infrastructure of the main carriers, often at more competitive prices — a sensible choice for short-term stays or anyone who prefers not to be tied to a contract.
2. Choose your operator. Your options are SK Telecom, KT, LG U+, or an MVNO. For those new to Korea who are not yet comfortable in Korean, selecting one of the three major carriers is generally advisable, given their nationwide reach and dedicated services for foreign residents.
3. Visit a store or airport counter. SIM cards are stocked at convenience stores throughout the country, and both Incheon Airport and Jeju Airport feature dedicated booths from KT, SK Telecom, and LG Uplus in their arrivals halls — a convenient option for travellers who want a working number the moment they touch down.
4. Prepare your documents. Your passport is essential. If you carry an ARC, bring that as well. For postpaid plans, have your Korean bank account details ready to set up direct debit.
5. Complete identity verification. Every operator is legally obliged to confirm your identity before issuing a SIM card. You will need to supply personal information — including your full name and passport number — regardless of whether you are purchasing a prepaid SIM or a prepaid eSIM.
6. Activate your SIM or plan. Physical SIM cards are generally activated on the spot in-store. If you are setting up an eSIM, activation is performed by scanning a QR code on a compatible device and can often be completed online within minutes.
7. Top up or set up monthly billing. Prepaid customers can add credit at convenience stores, through ATMs, via the operator’s app or website, or through the provider’s automated telephone service. Postpaid customers will receive a monthly invoice, typically settled through bank transfer or automatic direct debit.

If you are transitioning from a foreign number to a Korean one, note that the Mobile Number Portability (MNP) service is available exclusively for transferring numbers between South Korean operators. Bringing a non-Korean number onto a local network is not an option — most newcomers find the most practical solution is to get a Korean number for everyday use and rely on internet-based calling applications to maintain contact with people abroad.

How do I pay my telephone bill in South Korea?

Whether you have a landline or a mobile plan, telephone billing in South Korea operates on a monthly cycle. Invoices are typically generated at the close of each month, with payment due within a set window — usually between 10 and 20 days from the billing date. The overall structure is comparable to monthly billing systems in other developed countries, though the strong preference among Korean residents is for automatic rather than manual payment.

The most prevalent payment method is automatic bank transfer (자동이체, jadong ihche) — the Korean equivalent of a direct debit, drawn from your Korean bank account. This is arranged at the point of signing your contract, after which the monthly sum is deducted without any further action required on your part. It is the recommended approach for postpaid mobile and landline accounts, as it eliminates the risk of inadvertently missing a payment and frequently earns a modest monthly discount.

Additional payment options that are typically available include:

• Credit or debit card autopay: A Korean credit card can be registered for automatic monthly billing through the provider’s website or mobile app.
• Online banking: All major providers maintain apps and web portals allowing customers to make manual payments each month. The KT Customer Centre app, SKT’s T World app, and the LG U+ app are all available in Korean, with varying levels of English-language functionality.
• Convenience store payment: Certain bills — particularly those from MVNOs — can be settled at the counter of convenience stores such as GS25, CU, or 7-Eleven, using a printed bill slip (고지서, gojiseo) or a QR code.
• Prepaid top-up: If you are on a prepaid SIM, credit can be loaded at convenience stores, via ATM, through the operator’s app or website, or via the provider’s automated phone service.

Failing to pay on time will generally result in a reminder notice being issued before any service suspension takes effect. Reconnection after a suspension typically requires the outstanding balance to be cleared along with a modest administrative charge. For anyone managing finances in a language other than Korean, arranging automatic bank transfer from the very beginning is strongly recommended to prevent unintended lapses in service. Billing disputes can be directed to the operator’s customer service team, or escalated to the Korea Communications Commission (KCC).

Are there any practical tips for using phones in South Korea as a newcomer?

South Korea maintains an extensive network of public Wi-Fi hotspots, with all three major carriers providing free wireless access at airports, shopping centres, subway stations, and tourist sites. Even before acquiring a local SIM card, you are unlikely to find yourself completely offline in any urban environment.

Network quality and coverage
SK Telecom leads the field in terms of consistent signal quality and reliability, outperforming LG U+ by 7 percentage points and KT by 12.3 points on that measure. In practice, however, all three networks deliver strong performance for the everyday needs of city dwellers. LG U+ is particularly well regarded in urban settings for high-definition video streaming and low-latency gaming applications.

eSIMs
The eSIM ecosystem in South Korea continues to expand. KT supports eSIM on a selection of Samsung, Apple, and Google devices, with setup available either online or at a store. LG Uplus offers eSIM for iPhone users, though activation must be carried out at an LG Uplus store and cannot be completed online at this stage. SK Telecom also supports eSIM on compatible handsets. If you intend to use an eSIM, verify device compatibility with your chosen operator in advance. Availability is currently concentrated among higher-end smartphones, though the range of supported devices is broadening.

International roaming from South Korea
KT has the widest global roaming reach, with complimentary 2G data and voice services in more than 193 countries, while SK Telecom includes certain roaming benefits within its postpaid plans. If you travel internationally on a regular basis, it is worth comparing the roaming add-ons offered by each carrier before selecting a plan. All three operators have dedicated international roaming packages — review the current terms on their official websites prior to any trip abroad.

Number porting
Switching between South Korean mobile operators does not mean losing your Korean number — the Mobile Number Portability (MNP) service allows you to carry it across. The transfer process between Korean networks typically takes one to three working days, broadly in line with the timeframes seen in many other countries. It is not possible to port a foreign number into a South Korean network; a new Korean number will always be required.

KakaoTalk — a local essential
KakaoTalk occupies a uniquely central role in South Korean communication that has no precise equivalent in most other countries. Where WhatsApp dominates in many parts of the world, KakaoTalk is the platform through which the vast majority of Koreans — individuals and businesses alike — conduct their messaging. You will need it to communicate with landlords, colleagues, and new acquaintances. Installing it and registering with your new Korean number should be among the very first things you do after obtaining your SIM.

Phone use etiquette
South Koreans generally observe considerate norms around phone use in shared spaces. Talking loudly on calls in libraries, on public transport, or in restaurants is widely regarded as inconsiderate. Many subway carriages designate quiet zones where phone conversations are expected to be kept to a minimum. Keeping your volume down and being mindful of those around you will be appreciated.

Device compatibility
South Korean networks operate on internationally standard LTE and 5G frequency bands, meaning most modern unlocked smartphones purchased elsewhere in the world will function normally on a Korean SIM. If your handset is locked to your home carrier, you will need to arrange an unlock with that carrier before a Korean SIM can be used. It is advisable to sort this out before departing for South Korea.

Frequently Asked Questions

Can I keep my foreign number when I move to South Korea?

It is not possible to transfer a non-Korean phone number onto a South Korean network — number portability in Korea applies exclusively between domestic operators. Many newcomers manage the transition by keeping their foreign number active on a second SIM card or through their home carrier’s roaming service for a period, while using a newly acquired Korean number for everyday life in Korea. A dual-SIM smartphone makes running both numbers simultaneously straightforward.

Do I need a local address to get a SIM card in South Korea?

For a standard prepaid tourist SIM, a local address is generally not required — presenting your passport is usually sufficient. However, signing up for a postpaid contract or registering for certain MVNO plans will typically require you to provide a Korean residential address. Having your address details ready once you are settled will simplify the registration process considerably.

Can I get a phone contract without an Alien Registration Card (ARC)?

An ARC is a prerequisite for long-term residents — those remaining in Korea for 90 days or more. Short-term visitors staying under 90 days can generally register using only their passport and visa. If your ARC is still being processed after you arrive, opting for a prepaid SIM is the most practical interim solution until the card is in your hands.

Which mobile operator is best for expats in South Korea?

No single operator stands out as the best choice for every situation. KT and LG U+ tend to be more accessible to English-speaking customers in terms of in-store assistance, phone support, and online tools. SK Telecom, on the other hand, offers the broadest coverage in rural and remote areas. The right choice depends on your individual priorities — whether that is language accessibility, geographic coverage, pricing, or international roaming capability.

Are there cheap SIM options for people on a tight budget?

MVNO SIM cards can deliver prepaid plans priced below 10,000 KRW, though some come with speed throttling or data restrictions. The primary draw of MVNOs for consumers is their lower cost compared to direct contracts with the major carriers. Because MVNOs operate on the same physical networks as the big three, geographic coverage is identical — the difference, where it exists, lies in data caps or speeds on certain plans.

Is it easy to buy a SIM card at the airport when I arrive in South Korea?

Both Incheon Airport and Jeju Airport have dedicated counters from KT, SK Telecom, and LG U+ positioned in their arrivals areas, making it very easy to purchase a SIM card as soon as you land. All you need is your passport, and airport counter staff are well practised at helping international arrivals. Prepaid eSIMs are also available at some counters for travellers whose devices support the technology.

How do I make an international call from South Korea?

International calls from South Korea are placed by dialling 00N — where N represents the carrier access code — followed by the destination country code and the local number. For instance, using KT’s carrier code, you would dial 001, then 44 for the United Kingdom, followed by the relevant local number. On a mobile phone, entering the + symbol before the country code achieves the same result regardless of which network you are on. Voice and video calls made through apps such as KakaoTalk, WhatsApp, or FaceTime are also widely used for international communication and are typically free when connected to Wi-Fi.

What should I do if I have a problem with my phone service in South Korea?

Begin by contacting your operator’s customer service team directly. If the matter cannot be resolved through the provider, you have the option of lodging a formal complaint with the Korea Communications Commission (KCC) — the national telecommunications regulator charged with consumer protection in the sector. The Ministry of Science and ICT (MSIT) holds broader oversight of the telecommunications framework. For billing-related disputes in particular, some operators operate an internal mediation process — consult your contract or the provider’s website for details.