-Translation - AIS-CP 049/2005 April 29, 2005 Re: Notification of the Book Closing for Interest Payment of Debentures of the Company (AIS06NA) To: The President The Stock Exchange of Thailand Refer to: The Letter No. IVS. 05/0821 of Thai Military Bank on April 29, 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 (AIS06NA), 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 IVS.05/0821 April 29, 2005 President The Stock Exchange of Thailand 62 Rachadapisek Road, Bangkok 10110 RE : Scheduled closing the registered book for AIS06NA Dear Sir, We, THAI MILITARY BANK Pcl. As a Registrar & Paying Agent Debentures of ADVANCED INFO SERVICE PUBLIC COMPANY LIMITED NO.3/2001, DUE 2006 would like to announce that the registered book of AIS06NA will be closed from 12.00 on May 16, 2005 for the right to receive the interest. AIS06NA will be paid the interest on May 30, 2005 with interest rate 5.85 % from the period of February 28, 2005 to May 27, 2005 for 89 days. Yours faithfully, (Klairoong Tamanakijprasart) Manager IVS & IB Operations Department Registrar & Paying Agent IVS & IB Operations Department Tel. 0-2230-5575, 0-2230-5487