THIRD QUARTER 2017 FINANCIAL RESULTS UNDER IFRS TO BE RELEASED

ON NOVEMBER 9, 2017

ATHENS, Greece – October 17, 2017 – Hellenic Telecommunications Organization SA (ASE: HTO, OTC MARKET:HLTOY), announces that it will release its third quarter 2017 results under IFRS on Thursday, November 9, 2017, before the opening of the Athens Stock Exchange.

Following the above release OTE's management will host on the same day, a conference call with analysts and investors at 17:00 (GREECE) / 16:00 (CONTINENT) / 15:00 (UK) /10:00 (EASTERN US) to review said results.

Details regarding the conference call dial-in and replay numbers as well as the live audio webcast of the conference call, following the results, can be accessed at:

https://ote.irwebpage.com/conference_calls/