-Translation - AIS-CP 081/2005 August 3, 2005 Re: Notification of the Book Closing Date of Debentures and Debenture holders' Meeting To: The President The Stock Exchange of Thailand Advanced Info Service Public Company Limited ("the Company") would like to notify you that the Company will close the registration book of its debentures. The details of the Company's debentures are as follows: 1. Amortizing Debentures of Advanced Info Service Plc. No. 1/2001, due 2006 (AIS063A) 2. Debentures of Advanced Info Service Plc. No. 3/2001, due 2006 (AIS06NA) 3. Debentures of Advanced Info Service Plc. No. 1/2002, due 2009 (AIS093A) 4. Debentures of Advanced Info Service Plc. No. 2/2002, due 2009 (AIS093B) 5. Debentures of Advanced Info Service Plc. No. 3/2002, due 2007 (AIS073A) 6. Amortizing Debentures of Advanced Info Service Plc. No. 4/2002, due 2007 (AIS07OA) The Company will seek approval at the Debenture holders' Meeting to amend the terms and conditions of the dividend covenant of the Company's debentures in order to increase the flexibility in dividend payments. The Debenture holders' Meeting will be convening on August 31,2005 at 14.00 at the Grand Ballroom, Grand Hiatt Erawan Hotel, Bangkok. For the purpose of this meeting, the registration book of the Company's debentures will be closed from 12.00 of August 17, 2005 until the Debenture holders' Meeting is adjourned. Please be informed accordingly. We would appreciate it if you could attend the abovementioned Debenture holders' Meeting. Yours sincerely, (Signed) Siripen Sitasuwan (Mrs.) Director Advanced Info Service Public company Limited