KT Launches AI Voice Phishing Detection with Speaker ID

Seoul, South Korea - KT Corp announced that it will launch a voice phishing detection service on July 30, featuring speaker recognition and artificial intelligence voice detection functions, marking the first such integrated system in South Korea.

The telecommunications company said the service adds speaker recognition and AI-manipulated voice detection to its existing context-based detection technology.

KT said the additions are intended to identify criminals' voices and detect artificially generated speech.

The speaker recognition function received regulatory approval from the Personal Information Protection Commission, making it the first such technology to be commercialized domestically, according to KT.

The function analyzes voice patterns using audio data from voice phishing criminals provided by the National Forensic Service.

KT was selected for the Ministry of Science and ICT's regulatory sandbox program in October 2024.

The National Forensic Service spent 10 months reviewing and refining criminal voice data for the technology development, KT said.

The service includes detection technology for voices generated through AI text-to-speech systems.

KT said this technology was previously implemented at the National Health Insurance Service customer center in May 2024.

KT reported that its voice phishing detection service analyzed 14.6 million calls during the first half of 2025, achieving a 91.6% detection accuracy rate.

This compares to 90.3 percent when the service began operations. The company estimated the service prevented KRW 71 billion in damages during this period.

The company has signed agreements with financial institutions to share detection data with bank fraud detection systems.

KT signed a memorandum of understanding with the Korea Federation of Banks in May for the implementation of real-time account monitoring and blocking procedures.

KT said it targets annual damage prevention exceeding KRW 200 billion and detection accuracy above 95 percent with the updated service.

The service operates on Samsung Electronics Galaxy S23 series and newer devices through the "whowho" application, regardless of carrier.

KT said it plans to expand device compatibility.