[Taiwan Mobile] Amendment to the Rules for 4th Domestic Unsecured Convertible Bonds Approved by the FSC

1. Date of occurrence of the event: 2026/06/05 2. Company name: Taiwan Mobile Co., Ltd. 3. Relationship to the Company (please enter "head office" or "subsidiaries"): Head office 4. Reciprocal shareholding ratios: N/A 5. Cause of occurrence: In accordance with the Financial Supervisory Commission (FSC) order Jin-Guan-Zheng-Fa-Zi No. 1140382105 dated May 5, 2025, the Company revised the "Issuance and Conversion Rules for the 4th Domestic Unsecured Convertible Corporate Bonds". The amendment was approved by the FSC via letter Jin-Guan-Zheng-Fa-Zi No. 1150345758 on June 5, 2026. 6. Countermeasures: None 7. Any other matters that need to be specified: For the complete approved "Issuance and Conversion Rules for the 4th Domestic Unsecured Convertible Corporate Bonds", please refer to the "Bond Issuance Information Search" on the Market Observation Post System (MOPS).