No, a South Korean telephone number is not strictly required to register and operate a KakaoTalk account. Users globally can sign up for the messaging service using a standard mobile phone number issued by almost any country or telecommunication carrier worldwide. During the initial account creation and authentication phase, the platform sends a text message containing a verification code to the provided foreign or domestic number, allowing international users, travelers, and expatriates to seamlessly connect and communicate across borders without needing local residency.