-Translation - AIS-CP 032/2005 March 24, 2005 Re: Notification of the Book Closing for Interest Payment of Debentures of the Company (AIS070A) To: The President The Stock Exchange of Thailand Refer to: The Letter No. TCDO.39-480404 of Siam Commercial Bank on March 21, 2005 Advanced Info Service Public company Limited ("the Company") would like to inform you that the Company will close the registered book for interest payment of debentures of the Company (AIS070A), the details are shown in the referenced letter. Please be informed accordingly. Sincerely Yours, (Signed) Mr. Pong-Amorn Nimpoonsawat Chief Finance Officer Advanced Info Service Public company Limited Referenced Letter TCDO.39-480404 March 21, 2005 Notification of Book Closed Date for Interest Payment Managing Director 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 with face value of Baht 1,000 and offering amount at 5,000,000 units "the Debentures", the Company will pay interest on semi annual basis. Interest shall be payable on 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 fifth coupon payment is due on 21 April 2005. Coupon rate is 3.65 % per annum. The book closed date of the Debentures is on 7 April 2005 at noon. Please be informed accordingly. Yours faithfully, The Siam Commercial Bank Public Company Limited (Authorized Signatory)