Tobila Systems' Nuisance Information Database Utilized: au Hikari Phone 'Nuisance Call Blocking' Campaign Re-launched with Up to 6 Months Free Offer

Tobila Systems Inc. (Headquarters: Nagoya City, Aichi Prefecture; Representative Director and President: Atsushi Aketa; Securities Code: 4441; hereinafter 'Tobila Systems') is re-implementing a campaign to offer up to 6 months of free service for KDDI Corporation's (hereinafter 'KDDI') au Hikari Phone nuisance call blocking service, 'Nuisance Call Blocking' (hereinafter 'this service'), which utilizes Tobila Systems' 'Nuisance Information Database.' This campaign will run from April 15 to September 30, 2026. As the spread of special fraud damages becomes more severe and countermeasures for telephone calls are demanded, wider adoption in households is expected. ■ Special Fraud Damages Amount to 141.4 Billion Yen, Urgent Need for Enhanced Countermeasures In recent years, special fraud damages have continued to worsen. According to the National Police Agency, special fraud damages in 2025 reached 141.4 billion yen, marking the worst record ever (Note 1). 'Fake Police Fraud,' which accounts for approximately 70% of the damages, shows that the amount of damage per completed case is large for people in their 60s and 70s, and fixed-line telephones are frequently used as a contact tool with perpetrators in these age groups (Note 2). Given this situation, the 'Comprehensive Measures 2.0 to Protect Citizens from Fraud' announced by the Cabinet Office's Crime Countermeasures Ministerial Meeting, and requests from the Ministry of Internal Affairs and Communications to telecommunication carriers to strengthen special fraud countermeasures, indicate that enhanced special fraud countermeasures are required across society. ■ Our Database Utilization, au Hikari Phone 'Nuisance Call Blocking' 6 Months Free Offer Amidst this situation, KDDI, in response to requests from the Ministry of Internal Affairs and Communications, announced the re-implementation of a campaign to offer its au Hikari Phone nuisance call blocking service, 'Nuisance Call Blocking,' for a total of up to 6 months free of charge to those who apply and meet certain conditions between April 15 and September 30, 2026. This service utilizes Tobila Systems' 'Nuisance Information Database,' which automatically cross-references phone numbers during incoming and outgoing calls and blocks calls if they are identified as nuisance calls. It contributes to preventing damages by detecting nuisance calls with a high risk of leading to fraud with approximately 99% accuracy (Note 3). Through the free provision of this service, it is expected that our efforts to suppress fraud damages using our database will spread to more households. Furthermore, as the number of users of our database increases, the amount of information that can be collected increases, and its accuracy improves. This not only protects users themselves from danger but also contributes to the safety of other users. We will continue to promote initiatives aimed at eradicating special fraud. ■ About au Hikari Phone 'Nuisance Call Blocking' For details regarding KDDI's au Hikari Phone nuisance call blocking service, 'Nuisance Call Blocking,' and the free provision of this service, please refer to the information published on KDDI's official website below. KDDI 'Notice of Re-implementation of Special Fraud Damage Prevention Campaign' https://www.au.com/information/notice_internet/service/20260319-02/ (Note 1) National Police Agency, Public Relations Material on the Recognition and Arrest Status of Special Fraud and SNS-type Investment/Romance Fraud in Reiwa 7 (Provisional Figures) https://www.npa.go.jp/bureau/criminal/souni/tokusyusagi/hurikomesagi_toukei2025.pdf (Note 2) National Police Agency, Awareness Material on the Recognition and Arrest Status of Special Fraud and SNS-type Investment/Romance Fraud in Reiwa 7 (Provisional Figures) https://www.npa.go.jp/bureau/criminal/souni/tokusyusagi/sagi_keihatsu2025.pdf (Note 3) Tobila Systems, Aggregated Data from January to December 2025 ■ About Tobila Systems Aiming to solve social issues through technology, we provide services for the eradication of special fraud, phishing scams, and gray-zone crimes. Our 'Nuisance Information Filter Service,' which collects and investigates information on fraudulent calls and SMS to build a database and automatically filters them, is deployed for fixed-line phones, mobile phones, and businesses, and is used by approximately 15 million people monthly. Company Name: Tobila Systems Inc. Representative: Atsushi Aketa, Representative Director and President Securities Code: 4441 (Tokyo Stock Exchange Standard Market) Established: December 1, 2006 Location: Pacific Square Nagoya Nishiki 7F, 2-5-12 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture Official Website: https://tobila.com/