FN 132/2003 2 December 2003 To : The President The Stock Exchange of Thailand Re: Book Closing for Interest Payment of AIS073A Advanced Info Service Public company Limited issued Debentures of Advanced Info Service Public Company Limited No. 3/2545 Due in Year 2007 (AIS073A) on 21 March 2002. The interest payment will be made every 3 months, on 21 March, 21 June, 21 September and 21 December until maturity. If the interest payment date falls on a banking holiday, the payment will be made on the following business day without accruing interest onto that day. The book closing date for interest payment is 14 days prior to the interest payment date. For the interest payment of 21 December 2003, the Company will close its book at 12:00 a.m. on 8 December 2003 and will make interest payment on 22 December 2003. The interest rate of 5.25% will be calculated for 91 days from 21 September 2003 to 20 December 2003, totaling Baht 39,267,123.29. Please be informed accordingly. Sincerely Yours, (Signed) Mr. Somprasong Boonyachai Director Advanced Info Service Public Company Limited