In 2015, OTE Group adopted the Telekom brand for its operations in Albania and Romania. However in Greece, they instead adopted Cosmote as their uniform commercial brand in Greece covering fixed, broadband and mobile telephony. The brand was also refreshed and a new logo and strapline introduced.
Whilst Cosmote had always been the brand used for mobile telephony, the company had previously sold fixed (landline) and broadband services under the OTE brand.
No further changes were implemented until 2023, when activities began to raise awareness of the Telekom brand in Greece. In September, after Telekom’s T logo was added to the OTE Group building in Athens, the chief of Deutsche Telekom hinted that the logo may be adopted.
The website, stationery and printed advertisements and billboards were then updated to feature the Telekom logo in addition to the Cosmote branding with the statement "Member of the Telekom Group".
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Beginning in 2024, all commercials ended with the slogan "Cosmote, member of the Telekom Group". In addition, a new splash screen of the Telekom branding was added to Cosmote’s television advertisements.
Cosmote also branded various programmes and competitions as "Powered by Telekom" such as Women in Gaming and World Pass to further enhance customer awareness.
In April 2025, the company moved to a transition brand becoming Cosmote Telekom. The brand refresh also included a new tag line ‘Συνδέουμε τον κόσμο σου’ (Connecting your world)
In June 2026, at OTE’s general shareholder meeting, the company CEO announced that Cosmote Telekom will become Telekom in autumn 2026.
To reflect the transition to Telekom, the company introduced Magenta themed products and services including MagentaONE (previously Cosmote One), Magenta AI, Magenta Moments (previously Cosmote Deals for You), Magenta TV (previously Cosmote TV) and Magenta Pay (previously payzy). The T Phone 3 and T Tablet 2 also launched in Greece.
Cosmote Insurance is now known as Magenta Insurance and Cosmote TV became Magenta TV.
In addition, the Basketball arena at the OAKA (Olympic Athletic Center Athens) has been renamed Telekom Center Athens under a five year deal.
The completion of the transition to the Telekom brand happened on 7 September 2026.
1949–1964
23 October 1949: ΟΤΕ S.A. is founded (Legislative Decree 1049/49)
The first Greek telephone directory is published.
The TELEX service becomes operational.
1965–1989
The Greek long-distance telephone network is automated.
Laying of the submarine cable Greece-Italy MED 3 is completed.
The first antenna of the Centre of Satellite Communication in Thermopylae (the 6th in Europe) is set up.
The first fully digitised switching centres (long-distance and hub) of the EWSD/SIEMENS system are established.
1990–2000
ΟΤΕ expands to the Balkans, SE Europe and the Middle East.
ΟΤΕ is listed in the Athens Exchange (ASE).
OTE is listed on the New York Stock Exchange (NYSE).
OTE acquires an initial 35% stake in RomTelecom, the incumbent telephony company in Romania.
Acquires GSM License in Bulgaria and establishes Globul to exploit this license.
2000–2007
Satellite Hellas Sat2 is launched from Cape Canaveral.
OTE launches ADSL services in the Greek market.
OTE and COSMOTE act as Grand National Sponsors of the Athens 2004 Olympic Games.
OTE signs agreement to sell 90% of its holdings in ArmenTel (now Telecom Armenia) for approximately €342 million.
The Greek State sells 10.7% of OTE share capital to institutional investors.
OTE makes available new speeds reaching 24 Mbit/s.
2008–2010
OTE launches CONN-X TV (IPTV) to a limited number of existing clients for a trial period. This satellite TV service was the predecessor of OTE TV.
OTE's broadband connection reach 970,000, with presence points in its network extend to 1,390, nationwide.
The agreement between the Greek Government and Deutsche Telekom is signed, according to which, since 5 November, each will own 25% plus one share of OTE's share capital.
OTE acquires 100% of COSMOTE and its share is listed on the Athens Stock Exchange.
COSMOTE now owns 100% of GERMANOS SA, the leading retailer of telecommunications in the wider region of Southeast Europe.
Completion of the sale of Cosmofon in the former Yugoslav Republic of Macedonia held by COSMOTE.
After the sale of an additional 5% of the Greek State's shares and voting rights, Deutsche Telekom's stake in OTE stands at 30% while the Greek State holds 20%. COSMOTE completes acquisition of Telemobil S.A. (Zapp) in Romania.
OTE introduces Conn-x TV, which is based on IPTV technology.
Michael Tsamaz, CEO of OTE Group's mobile arm COSMOTE, assumes the position of OTE President & CEO.
OTE delists from the New York Stock Exchange.
2011–2026
Deutsche Telekom acquires an extra 10% of OTE share capital raising its stake to 40%.
The company signs three-year Collective Labour Agreement with the Federation of OTE Employees OME-OTE, achieving personnel costs reduction and securing employment for OTE regular employees.
Introduces OTE TV via Satellite and integrates all of the pay TV services it offers under the brand name OTE TV.
OTE signs agreement for the sale of the minority stake in Telekom Srbija, of which owns 20%, for about €400 million.
Launches reduced prices of up to 25% for Double Play Unlimited Plans that combine Internet and unlimited telephony to fixed lines.
OTE TV subscriber base reaches 100.000, following the continuous strengthening of the platform with new channels, services and HD content.
Launches new VDSL Internet services, with speeds up to 50 Mbit/s.
Successfully completes two Voluntary Redundancy Schemes, the incentives of which 1,516 people in the company accepted.
Raises €700 million through 5-year fixed coupon notes, following the successful completion of a bookbuilding process.
Announces the signing of an agreement to sell its 99.05% stake in Hellas Sat, to Arabsat, for 208 million euros, plus 7 million in dividends.
Announces the signing of an agreement to sell its 100% stake in Cosmo Bulgaria Mobile EAD (Globul) and Germanos Telecom Bulgaria (Germanos) to Telenor, the Norwegian telecom operator. The agreement consideration reached €717 million (enterprise value).
OTE announced the expansion of its VDSL network with 367 local exchanges and 2,732 outdoor cabins activated in October and extending VDSL availability to 1.3 million households and businesses.
On 26 October 2015 it establishes COSMOTE as a single brand for all its products and services.
In 2017, OTE's management announced that priority is to develop fiber optic networks and that total investment for the period until 2020 will amount to €1.5 billion.
In 2024, OTE Group announced the consolidation of its Cosmote brand with the Deutsche Telekom brand, forming Cosmote Telekom.
In 2026, OTE announced that the Cosmote Telekom brand name will change to Telekom in the autumn of the same year.
Subsidiaries
Greece
Telekom eValue (formerly COSMOTE eValue) (100%): Contact Center services.
Germanos (100%): Technology products and telecommunications services.
Magenta Insurance (formerly COSMOTE Insurance) (100%): A solely owned subsidiary of OTE since 1997, specialized in private insurance. It provides its services to OTE Group, its Human Resources, as well as to the general public.
OTE Estate (100%): Management of OTE Group's real estate assets.
OTE Academy (100%): Education and advanced vocational training. Venues for corporate events and seminars.
International subsidiaries
Telekom HBS (formerly COSMOTE Global Solutions)
