-Translation - AIS-CP 087/2005 August 16, 2005 Re: Change the Book Closing of Debentures and Debenture holders' Meeting To: The President The Stock Exchange of Thailand Refer: Letter of the Company No. AIS-CP 081/2005 dated on August 3, 2005. According to the letter of Advanced Info Service Public Company Limited ("the Company") No. AIS-CP 081/2005, the Company will close the registration book of its debentures and convene the Debenture holders'Meeting to amend the terms and conditions of the dividend covenant of the Company's 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. Amortizing 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 would like to notify that the Company has to cancel the previous Debenture holders' Meeting since the top executive of the Company has engaged in an urgent business aboard. The new schedule of Debenture holders' Meeting is as follows: Schedule Old New the registration August 17,2005, August 29,2005, book closing at 12.00 until the at 12.00 until the Debenture holders'Meeting Debenture holders' Meeting is adjourned. is adjourned. Debenture holders' Meeting - Time August 31,2005 at 14.00 September 12,2005 at 14.00 - Place the Grand Ballroom, the Grand Ballroom, Grand Hyatt Erawan Hotel, Four Seasons Hotel, Bangkok Rajadamri Road, Bangkok 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. After the Company has obtained the conclusion of the terms and conditions of the dividend covenant, the Company shall notify such terms and conditions of the dividend covenant to the Stock Exchange of Thailand immediately. Please be informed accordingly. Yours sincerely, (Signed) Pong-Amorn Nimpoonsawat (Mr.) Chief Finance Officer Advanced Info Service Public company Limited