-Translation- AIS-CP 075/2009 August 24, 2009 Subject: Notification of the adjustment to exercise price and exercise ratio of ESOP Warrants Grant IV and V To: The President The Stock Exchange of Thailand According to the Board of Director Meeting of Advanced Info Service Public Company Limited (the "Company") No. 5/2009, which was held on August 13, 2009 had passed a resolution to approve an interim dividend payment for the first half operating result of 2009 at the rate of Baht 3.00 per share, approximately totaling Baht 8,889.87 million to shareholders. Upon the resolution, the Company has announced to distribute the dividends in excess of 50% of the net profit after income tax of its consolidated financial statement. This has affected on the adjustment to exercise price and exercise ratio of warrants to purchase the Company's ordinary shares, which were offered to directors and employees of the Company (ESOP) Grant IV and V as stated in Clause 2.6 (v) of the Prospectus offering the ESOP Program. The ESOP warrant holders shall not be decreased their rights. Therefore, the adjustment to exercise price and exercise ratio of ESOP warrants are shown as follow; ESOP Grant IV Before adjustment After adjustment Exercise price (Baht per share) 90.851 89.292 Exercise ratio (warrant:common shares) 1:1.17405 1:1.19454 Number of shares to be allotted (shares) 10,841,434 11,003,027* ESOP Grant V Before adjustment After adjustment Exercise price (Baht per share) 80.409 79.029 Exercise ratio (warrant:common shares) 1:1.13751 1:1.15737 Number of shares to be allotted (shares) 9,591,786 9,679,317* Number of additional shares to be allotted Total 249,124 shares* after adjustment of exercise price and exercise ratio of ESOP * The Company will allot the additional shares to reserve for the new exercise ratio of ESOP in the AGM 2010. The new exercise price and new exercise ratio shall be effective immediately on August 25, 2009, which is the first day of XD sign posting onwards. As a result, the Company currently has sufficiently reserved shares for the exercise of ESOP warrants. The Company will allot the additional shares to reserve for the new exercise ratio of ESOP Grant IV and V in the 2010 Annual General Meeting of Shareholders. Yours faithfully, -Signed- Mr. Pong-amorn Nimpoonsawat Chief Finance Officer Advanced Info Services Plc. Cc: The Securities and Exchange Commission