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South Korea 📱 Mobile Network

Area Code 18 – Mobile Network

The phone area code for Mobile Network is 18 (international format +8218). Browse local exchange codes (NXX) and carrier assignments below.

Current Local Time
03:37:08
UTC • UTC +00:00
Full Dialing Format
+8218
Population N/A
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Admin Region South Korea
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Elevation N/A
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GPS Coordinates N/A
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Understanding South Korea's +82 18 Mobile Prefix

The +82 18 prefix in South Korea is a non-geographic mobile network code historically associated with specific Mobile Network Operators (MNOs) and Mobile Virtual Network Operators (MVNOs). Unlike geographic area codes that correspond to physical regions, the 18 prefix is allocated for mobile services, meaning the number is not tied to a fixed location. This allows users to retain their number when moving across the country, as long as they stay with the same carrier or port to another that supports the prefix.

South Korean mobile numbers, including those starting with 18, typically consist of 10 to 11 digits in total when dialed internationally. The international format is +82 18 XXXX XXX (or +82 18 XXXX XXXX for 11-digit numbers), where the leading '0' of the national significant number (NSN) is omitted. For example, a domestic number like 018-1234-5678 would be dialed as +82 18-1234-5678 from abroad. Within South Korea, callers must dial the full national number including the leading '0', so 018-1234-5678.

Historically, the 18 prefix was used by carriers such as Shinsegi Telecom and later merged into SK Telecom. Today, due to number portability, a number starting with 18 may not necessarily belong to its original carrier; it could be ported to any MNO or MVNO. This means that the prefix alone does not determine the operator, and routing is handled via a centralized database.

For international callers, it is crucial to use the correct country code (+82) and to drop the trunk prefix '0' when dialing from outside South Korea. SMS and voice calls to +82 18 numbers are routed over international networks and may incur higher charges depending on the caller's carrier. Mobile number portability (MNP) is well-established in South Korea, so users can switch operators while keeping their 18-prefix number, ensuring continuity of service.

When dialing from a foreign country, always check with your service provider for international dialing rates. For businesses, it is important to verify the current status of any 18 number, as some prefixes may be reallocated or used by MVNOs offering specialized plans. Always use the full international format to avoid misdialing.

❓ Frequently Asked Questions

What is the country code for South Korea?
The country code for South Korea is +82. When dialing a South Korean number from abroad, you must use +82 followed by the national number without the leading '0'.
Are 18 prefix numbers in South Korea mobile or landline?
The 18 prefix is a non-geographic mobile prefix. It is used for mobile services, not landlines. However, due to number portability, the actual operator may vary.
How do I dial a +82 18 number from the United States?
From the US, dial the international access code '011', then '82', then the 18 prefix and the subscriber number without the leading '0'. For example, 011-82-18-1234-5678.
Can I port my 18 prefix number to another carrier?
Yes, South Korea supports mobile number portability. You can keep your 18 prefix number when switching to another mobile operator, subject to the carrier's policies.
Are calls to +82 18 numbers expensive?
International call rates to +82 18 numbers depend on your telecom provider. They are typically charged at international mobile rates, which may be higher than domestic calls. Check with your carrier for specific pricing.