Key Things to Know Before Sending SMS to South Korea

When sending SMS to South Korean mobile users, compliance and delivery reliability are critical. The Korean telecom landscape is unique, with strict filtering policies and legal requirements that international businesses must follow.

Here are five key things you must consider when delivering SMS to South Korea:

Sender ID Registration is Mandatory
All SMS must originate from a pre-registered sender ID. Messages from unregistered numbers are likely to be blocked or filtered by local carriers.
Avoid Spam-Triggering Keywords
Korean telecom operators use aggressive spam filters. Words like ?쐄ree,???쐃vent,???쐏romotion,???쐁lick here,??or shortened URLs can trigger automatic blocks or delays.
Include Opt-Out Instructions
Marketing SMS messages must include a clear and simple opt-out option, such as a phrase like ?쏳eply STOP to unsubscribe,??to comply with Korean law.
Respect Local Time Zones
Do not send SMS during late-night or early morning hours. South Korea follows UTC+9, and sending messages outside business hours may cause user complaints or higher opt-out rates.
Understand Carrier-Specific Rules
Major carriers like SKT, KT, and LG U+ each have their own unique filtering mechanisms. Work with a messaging provider that understands and navigates these differences effectively.

Need Help?
At SureM, we specialize in compliant, high-deliverability messaging to South Korea. Our platform ensures your messages reach your customers securely and on time ??with full local support.

Visit http://www.surem.net to learn more about our global messaging solutions.

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