-Translation- AIS-CP 039/2009 April 10, 2009 Subject: Notification of the adjustment to exercise price and exercise ratio of ESOP Warrants Grant III, IV, and V To: The President The Stock Exchange of Thailand According to the 2009 Annual General Meeting of Shareholders of Advanced Info Service Public Company Limited (the "Company") which was held on April 8, 2009 had passed a resolution to approve the dividend payment for the second half operating result of 2008 at the rate of Baht 3.30 per share, approximately totaling Baht 9,775.55 million to the shareholders of the Company. 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 III, 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 III Before adjustment After adjustment Exercise price (Baht per share) 79.646 77.201 Exercise ratio (warrant:common shares) 1 : 1.15247 1 : 1.18897 Number of shares to be allotted (shares) 4,766,874 4,974,413* ESOP Grant IV Before adjustment After adjustment Exercise price (Baht per share) 93.728 90.851 Exercise ratio (warrant : common shares) 1 : 1.13801 1 : 1.17405 Number of shares to be allotted (shares) 10,391,434 10,814,292* ESOP Grant V Before adjustment After adjustment Exercise price (Baht per share) 82.956 80.409 Exercise ratio (warrant : common shares) 1 : 1.10259 1 : 1.13751 Number of shares to be allotted (shares) 9,931,349 10,342,810* Number of additional shares to be allotted after Total 1,041,857 shares adjustment of exercise price and exercise ratio of ESOP * Calculated from the outstanding of unexercised warrants The new exercise price and new exercise ratio shall be effective immediately on April 16, 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 has already allotted the additional shares to reserve for the new exercise ratio of ESOP Grant III, IV, and V in the 2009 Annual General Meeting of Shareholders. Yours faithfully, -Signed- Mr. Pong-amorn Nimpoonsawat Chief Finance Officer Advanced Info Services Plc. Compliance Department Tel. 02-687-4278, 02-615-3277 Cc: The Securities and Exchange Commission