Hellenic Telecommunications Organization SA (ASE: HTO, NYSE: OTE), the Greek full-service telecommunications provider, announces that it will release its fourth quarter and full year 2007 results under IFRS on Thursday, March 20, 2008. The press release will be issued in the morning, and OTE?s management will host a conference call at 17:00 (GREECE) / 16:00 PM (CONTINENT) / 15:00 (UK) /10:00 (EASTERN US) of the same date, to review the results.

Cosmote, OTEs mobile telephony subsidiary, now over 99.0% held by OTE, will announce its results on Wednesday, March 19, 2008. In addition, OTE announces that it will release highlights of its 2008-2010 Group Business Plan during the week of April 7, 2008. Further details, including exact date and time, meeting venue and conference call/webcast dial-in information, will be announced at a later date.