Αthens, April 26, 2005 - Hellenic Telecommunications Organization SA (ASE: HTO, NYSE: OTE) the Greek full-service telecommunications provider, announces that it bought 15,416,523 Cosmote S.A common shares in the period between April 5 and April 25, 2005, representing approximately 4.64 % of the outstanding share capital of its Greek mobile phone subsidiary. OTE S.A.?s participation in Cosmote?s share capital now stands at 64.37%.