-Translation - AIS-CP 057/2006 April 28, 2006 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.06/1260 of TMB Bank PLC on April 27, 2006 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. Anek Pana-apichon Vice President-Finance & Accounting Shin Corporation Group Referenced letter IVS.06/1260 April 27, 2006 President The Stock Exchange of Thailand 62 Rachadapisek Road, Bangkok 10110 RE: Scheduled closing the registered book for AIS06NA Dear Sir, We, TMB BANK Public Company Limited. 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 15, 2006 for the right to receive the interest rate for the period # 18. AIS06NA will be paid the interest on May 29, 2006 with interest rate 5.85 % from the period of February 28, 2006 to May 27, 2006 for 89 days. Yours faithfully, TMB Bank Public Company Limited. (Mrs.Klairoong Tamanakijprasart ) Authorized Signature Registrar and Paying Agent