Number format
South Korea's country code is +82. Mobile numbers start with 010 locally, for example 010-1234-5678. For international sending, drop the leading 0: +82 10 1234 5678 (or 821012345678).
Sender ID is a real requirement
Korean networks generally expect the sender number to be registered. Messages from an unregistered or unsuitable sender can be blocked. Before you start, ask us how sender setup works for your account, and do not assume a custom name will display.
Promotional messages
Korean law sets conditions for advertising messages. In general this means the recipient has agreed to receive them, the message is clearly marked as advertising, it includes a way to opt out, and sending during night hours is restricted unless there is separate consent. The exact requirements are set by Korean law and can change, so check them with a local adviser.
Transactional messages such as OTP codes and order confirmations are treated differently from advertising, which is why it matters to keep the two types separate.
Language and length
Korean text (Hangul) uses a different encoding from plain English, so fewer characters fit in one message and longer texts are split into parts. Each part is charged. Write short, test the character count in the panel.
Typical uses
OTP for apps and services, order and delivery notices, reservation reminders, and opted-in promotions.
Billing
Prepaid balance, billed per message to Korea. Rates are inside your account. See pricing.