-Translation - AIS-CP 047/2005 April 22, 2005 Re: Notification of the Book Closing of debentures of the Company (AIS063A, AIS06NA,AIS093A, AIS093B and AIS073A) To: The President The Stock Exchange of Thailand Refer to: The Letter No. IVS. 05/0728 of Thai Military Bank on April 19, 2005 Advanced Info Service Public company Limited ("the Company") would like to inform you that the Company will close the registered book of debentures of the Company (AIS063A, AIS06NA, AIS093A, AIS093B and AIS073A), 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.05/0728 April 19, 2005 President The Stock Exchange of Thailand 62 Rachadapisek Road, Bangkok 10110 RE : Scheduled closing the registered book for AIS Dear Sir, We, THAI MILITARY BANK Plc. As a Registrar & Paying Agent Debentures of ADVANCED INFO SERVICE PUBLIC COMPANY LIMITED would like to announce that registered book will be closed from 12.00 on May 3, 2005 in order to send documents. Details are as follows: - Advanced Info Service Public Company Limited No.1/2002, DUE 2009 ( AIS093A ) - Advanced Info Service Public Company Limited No.2/2002, DUE 2009 ( AIS093B ) - Advanced Info Service Public Company Limited No.3/2002, DUE 2007 ( AIS073A ) - Advanced Info Service Public Company Limited No.1/2001, DUE 2006 ( AIS063A ) - Advanced Info Service Public Company Limited No.3/2001, DUE 2006 ( AIS06NA ) In accordance with Merger and Acquisition between DBS Thai Danu Bank Pcl and Thai Military Bank Pcl. effective on September 1, 2004, we were conflict of interest under the obligation as stated in the SEC'S Notification (Kor. Jor. 33/2544), Section 2, Part 1 Conflict of Interest, Clause 9 (5), regarding Executive Broad of Director being the same person. Such that the SEC could not allow us to act as Bondholder's Representative of Bond mentioned above. We therefore, would like to inform Security Exchange of Thailand to close Registration Book for further action as practicable. Yours faithfully, (Klairoong Tamanakijprasart) Manager IVS & IB Ops. Department Registrar & Paying Agent IVS & IB Ops. Department Tel. 0-2230-5575, 0-2230-5487