-Translation - AIS-CP 028/2006 February 23, 2006 Subject: Notification of the Book Closing for Interest Payment and Principal for the last period of Debentures of the Company (AIS063A) To: The President The Stock Exchange of Thailand Refer to: The Letter No. IVS.Ops.06/0533 of TMB Bank Plc. on February 22, 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 and principal for the last period of debentures of the Company (AIS063A), 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.Ops.06/0533 February 22, 2006 President The Stock Exchange of Thailand RE : Closing the registered book for redemption and suspended trading of AIS063A We, TMB BANK Public Company Limited. As a Registrar & Paying Agent Debentures of ADVANCED INFO SERVICE PUBLIC COMPANY LIMITED NO.1/2001, DUE 2006 would like to announce that the registered book of redemption on AIS063A will be closed from 12.00 on March 9, 2006 for the right to receive the interest and principal for the last period which will be paid on March 23, 2006 with interest rate 5.30 % from the period of September 23, 2005 to March 22, 2006 for 181 days and principal repayment at THB. 125 per unit. Therefore, to comply with the settlement and securities transfer system, AIS has asked the SET to suspend trading of AIS063A effective between March 7,2006 to March 23, 2006 and delisted from SET since March 24, 2006 onwaords. The further details of the redemption are as follows; - In case that bondholders would like to redeem by themselves, they should contact Registrar at Thai Military Bank Plc. Computer Building 2th Floor, Silom Road, Bangrak, Bangkok 10500 and will get principal and interest by cheque from 20-23 March, 2006 - In case that the redemption process was done by registered mail, bondholders should send their debenture certificates by registered mail to Registrar at Thai Military Bank Plc. Computer Building th Floor, Silom Road, Bangrak, Bangkok 10500 within March 17, 2006. Upon Receipt the registrar will deliver cheque of principal and interest via registered mail within March 20, 2006 at their address which are in the registrar book at 12.00 hours of March 9, 2006 Yours faithfully, TMB Bank Public Company Limited. (Mrs. Klairoong Tamanakijprasart) Authorized Signature Registrar and Paying Agent IVS & IB Ops. Department Tel. 0-2230-5575, 0-2230-5487