- Translation - CP- AIS 045/2004 April 30, 2004 Re: Notification of the Book Closing for Interest Payment of Debentures of the Company (AIS04NA and AIS06NA) To: The President The Stock Exchange of Thailand Refer to: The Letter No. IVS 04/0703 and 04/0707 of DBS THAI DANU BANK PLC. on April 30, 2004 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 (AIS04NA and 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 Group Compliance Tel. 0 2299 5561 Referenced Letter IVS 04/0703 April 30, 2004 President The Stock Exchange of Thailand 62 Rachadapisek Road, Bangkok 10110 RE : Scheduled closing the registered book for AIS04NA Dear Sir, We, DBS THAIDANU BANK As a Registrar & Paying Agent Debentures of ADVANCED INFO SERVICE PUBLIC COMPANY LIMITED NO.2/2001, DUE 2004, would like to announce that the registered book of AIS04NA will be closed from 12.00 on May 14, 2004 for the right to receive the interest. AIS04NA will be paid the interest on May 28, 2004 with interest rate 4.70% from the period of November 28, 2003 to May 27, 2004 for 182 days. Yours faithfully, (Klairoong Tanamakijprasart) Manager IVS Operations Department Registrar & Paying Agent IVS Operations Department Tel. 0-2230-5575, 0-2230-5487 IVS 04/0707 April 30, 2004 President The Stock Exchange of Thailand 62 Rachadapisek Road, Bangkok 10110 RE : Scheduled closing the registered book for AIS06NA Dear Sir, We, DBS THAIDANU BANK 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 14, 2004 for the right to receive the interest. AIS06NA will be paid the interest on May 28, 2004 with interest rate 5.85% from the period of February 28, 2004 to May 27, 2004 for 90 days. Yours faithfully, (Klairoong Tanamakijprasart) Manager IVS Operations Department Registrar & Paying Agent IVS Operations Department Tel. 0-2230-5575, 0-2230-5487