(Translation) AIS-CP 053/2006 April 21, 2006 Subject: Resignation of Director of Advanced Info Service Plc. To: The President The Stock Exchange of Thailand Refer to the letter of Mr. Boonchoo Direksathaporn which Advanced Info Service Public Company Limited (ADVANC) received on April 18, 2006, ADVANC would like to inform you that Mr. Boonchoo Direksathaporn, Independent Director and Chairman of the Audit Committee of ADVANC resigned from the Board of Directors, effective on April 19, 2006 onwards. Yours faithfully, -Signed- Somprasong Boonyachai (Mr.) Director Advanced Info Service Public Company Limited