Notice of Second Quarter 2013 Financial Results

2013 SECOND QUARTER RESULTS UNDER IFRS TO BE RELEASED

ON AUGUST 8, 2013

ATHENS, Greece - July 9, 2013 - Hellenic Telecommunications Organization SA (ASE: HTO, OTC MARKET:HLTOY), the Greek full-service telecommunications provider, announces thatit will release its second quarter 2013 results under IFRS on Thursday, August 8, 2013.

OTE's management will host a conference call at 17:00 (GREECE) / 16:00 (CONTINENT) / 15:00 (UK) /10:00 (EASTERN US) following the release, to review the results.

Details regarding conference call dial-in and replay numbers as well as the live audio webcast of the conference call, following the results release, will follow.

OTE Group is Greece's leading telecommunications organization and one of the pre-eminent players in Southeastern Europe, providing top-quality products and services to its customers.

Apart from serving as a full service telecommunications group in the Greek telecoms market, OTE Group has also expanded during the last decade its geographical footprint throughout South East Europe, acquiring stake in the incumbent telecommunications company of Romania, and establishing mobile operations in Albania, Bulgaria, and Romania. At present, companies in which OTE Group has an equity interest employ more than 27,500 people in four countries, and our portfolio of solutions ranges from fixed and mobile telephony to Internet applications, satellite, maritime communications and consultancy services.

OTE shares are listed on the Athens Stock Exchange, and the London Stock Exchange (in the form of GDRs). Following their delisting from NYSE in September 2010, the company's ADRs trade in the US OTC market. OTE's American Depositary Receipts (ADR's) represent ½ ordinary share.

Additional Information is also available on http://www.ote.gr.

Contacts:

Dimitris Tzelepis - Head of Investor Relations

Tel: +30 210 611 1574, Email: [email protected]

Maria Kountouri - Assistant to the Head of Investor Relations

Tel: +30 210 611 5381, Email: [email protected]

Kostas Maselis - Senior Financial Analyst, Investor Relations

Tel: + 30 210 611 7593, Email: [email protected]

Christina Hadjigeorgiou - Financial Analyst, Investor Relations

Tel: +30 210 611 1428, Email: [email protected] 

Sofia Ziavra - Financial Analyst, Investor Relations

Tel: + 30 210 611 8190, Email: [email protected]

Daria Kozanoglou - Senior Communications & Regulatory Affairs Officer,

Investor Relations

Tel: +30 210 611 1121, Email: [email protected]

Eftychia Tourna - Communications & Regulatory Affairs Officer, Investor Relations

Tel: +30 210 611 7236, Email:[email protected]

Eleni Agoglossaki - Communications & Regulatory Affairs Officer, Investor Relations

Tel: +30 210 611 7880, Email: [email protected]