-Translation- AIS-CP 069/2010 July 16, 2010 Subject: Notification of an investment in joint venture To: The President The Stock Exchange of Thailand Pursuant to announcement of the Mobile Number Portability (MNP) by the National Telecommunications Commission (NTC) prescribing those telecom operators shall set up a joint clearing house to facilitate porting of mobile number. In compliance with the law, Advanced Info Service Public Company Limited ("the Company") would like to inform that it had invested in Clearing House for Number Portability Co., Ltd., a joint investment of 5 telecom operators in Thailand to provide mobile number portability service. The Company subscribed 4,000 ordinary shares at the par value of Baht 100 per share, representing 20% of its issued and paid-up capital; the total investment was Baht 400,000. The Clearing House for Number Portability Co., Ltd. has been registered with the Minister of Commerce. Clearing House for Number Portability Co., Ltd. has a registered capital of Baht 2,000,000 (Baht two million), divided into 20,000 ordinary shares with a par value of Baht 100 per share. Details of shareholders are as follow: 1. Advanced Info Service Plc. 20% 2. Total Access Communication Plc. 20% 3. True Move Co., Ltd. 20% 4. CAT Telecom Plc. 20% 5. TOT Plc. 20% This transaction is not regarded as a connected transaction and a transaction size is not considered as a major acquisition and disposition of assets according to the Notification of Capital Market Supervisory Board and regulations of the Stock Exchange of Thailand. Please be informed accordingly Best Regards, -Signed- Mr. Vikrom Sriprataks Director Advanced Info Services Plc.