- Translation - AIS-CP 095/2007 September 20, 2007 Subject: Notification of the Book Closing for Interest and Principle Payment of AIS07OA for Redemption To: The President The Stock Exchange of Thailand Refer to: The Letter No. MKOT.65 - 501501 of Siam Commercial on September 20, 2007 Advanced Info Service Public Company Limited ("the Company") would like to inform you that the Company will close the registered book for interest and principle payment of AIS07OA for redemption, the details are shown in the referenced letter. Please be informed accordingly. Yours faithfully, -signed- Mr. Pong-Amorn Nimpoonsawat Chief Finance Officer Advanced Info Service Plc. Referenced Letter MKOT.65 - 501501 September 20, 2007 Notification of Book Closed Date for Interest and Principle Payment The Stock Exchange of Thailand With reference to Debentures issued by Advanced Info Service Public Company Limited named The Amortizing Debentures of Advanced Info Service Public Company Limited No.4/2002 Due 2007 (AIS07OA) with face value of Baht 1,000 and offering amount at 5,000,000 units "the Debentures" ,the Company will pay amortizing and interest on semi annual basis. Interest shall be payable on 21 April and 21 October of each year throughout the term of the Debentures. The Bank as a capacity of Registrar of the Debentures would like to inform that the tenth coupon payment and maturity date is due on October 22, 2007 (postpone from October 21, 2007 since it is the holiday). Coupon rate is 3.65% per annum. Calculation period is 184 days starting from April 21, 2007 to October 21, 2007. The book closed date of the Debentures is on October 8, 2007 at noon. Therefore, to comply with the settlement and securities system, we would like to inform that the Stock Exchange of Thailand to suspend trading on AIS07OA commencing from 4 October 2007 to 21 October 2007. Since 22 October 2007 AIS07OA debentures will no longer be listed securities on the Stock Exchange of Thailand. Please be informed accordingly. Yours faithfully, The Siam Commercial Bank Public Company Limited (Authorized Signatory)