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Mobile Signature Guide in Korea: Step-by-Step for Foreign Residents

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🌍 Foreign Residents in Korea Series

Step-by-step guides for foreigners living in Korea — from address registration and visa to banking, taxes, and digital certificates.

Easily learn how to activate and use a mobile signature in Korea for authentication and online government services.

Mobile Signature Guide in Korea: Step-by-Step for Foreign Residents

In short

This guide explains how foreigners in Korea can register and use a mobile signature (모바일서명) for secure identity verification, online banking, and government service access through apps like Government24 and PASS.

What is a Mobile Signature in Korea

A mobile signature (모바일서명) is a verified digital identity used in Korea to replace physical certificates for secure online transactions. It allows users to sign documents, verify identity for online banking, and log in to public services without needing a separate certificate file.

It is often linked to your mobile carrier’s authentication service (SKT, KT, LG U+), and can also be used through government-integrated apps such as Government24 and PASS.

How to Apply for a Mobile Signature

You can easily register for a mobile signature in Korea using your smartphone. The process usually takes less than five minutes.

  1. Download your telecom’s authentication app (e.g., PASS or U+ 인증).
  2. Verify your phone number using your Alien Registration Card (ARC) and a local phone plan under your name.
  3. Open the app and select “Mobile Signature Registration” (모바일서명 등록).
  4. Authenticate via your PIN or biometric method (fingerprint or face ID).
  5. Confirm your identity with a one-time password (OTP) or SMS verification code.
💡 Tip Make sure your mobile number is registered under your name to complete identity verification successfully.

How to Use Mobile Signature for Verification

Once registered, you can use your mobile signature across multiple services:

  • Government24 (정부24): Log in or submit documents for certificates and applications.
  • HiKorea: Use it for immigration applications and ARC renewals.
  • Bank apps: Authorize fund transfers or confirm your identity securely.

When prompted, simply select “Mobile Signature” as your verification method and approve the request through your telecom app.

⚠️ Note Your mobile signature is valid only as long as your phone line remains active and linked to your personal ID.

Common Issues and Solutions

If you encounter errors during registration or verification, consider the following:

  • App not verifying: Reinstall the app and clear cache.
  • Phone number mismatch: Ensure your registered telecom information matches your ID.
  • Foreign name not recognized: Try using the English spelling registered with your telecom provider.

Frequently Asked Questions

  1. Q. Can foreigners use mobile signature in Korea?
    A. Yes. As long as you have an Alien Registration Card and a mobile plan under your name, you can register and use mobile signature through apps like PASS or your telecom provider’s app.
  2. Q. Is mobile signature the same as a digital certificate?
    A. Not exactly. It replaces the older certificate system by allowing direct authentication via your phone without installing separate certificate files.

Notes

Note. Mobile signature is a convenient alternative to joint certificates, especially for foreign residents using government or banking services in Korea.

Explore the Series

More step-by-step guides for foreigners in Korea. Browse them on the hub, or jump directly below.

🌏 View Full Series Hub

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