Cosmote Mobile Telecommunications S.A., along with its subsidiaries, provides mobile telephony services. It offers mobile, fixed telephony, and Internet services. The company also retails contract plans; smartphones, iPhones, iPads, tablets, accessories, mobile phones, new mobiles, 4G mobile phones, Android phones, and Windows mobiles; and mobile Internet devices, 3G / 4G tablets, Wi-Fi tablets, USB sticks, pocket Wi-Fi, and Internet on the go cards. Cosmote Mobile Telecommunications S.A. was formerly known as Cellular Operating System of Mobile Telecommunications S.A. and changed its name to Cosmote Mobile Telecommunications S.A. in June 1999.

The company was incorporated in 1996 and is based in Athens, Greece with subsidiaries in Greece, Albania, and Romania. Cosmote Mobile Telecommunications S.A. operates as a subsidiary of Hellenic Telecommunications Organization SA.

COSMOTE is the unified commercial brand for all OTE Group fixed, mobile, Internet & pay TV products and services. It signals an integrated communications and entertainment world, in which all clients – consumers and businesses alike – enjoy advanced solutions for the entire range of their communication needs with simplicity, with a single point of reference and a unified experience at all contact points: shops, call centers and online. OTE Group is the leading telecommunications provider in Greece and along with its subsidiaries constitutes one of the top telecom Groups in Southeast Europe. The Group is also the largest investor in Greece in new technologies and infrastructure, with investments exceeding €2 bn. over the past six years and €1.5 bn. in the current four-year period. OTE Group’s size, expertise and experience guarantee the quality of services offered under the unified COSMOTE commercial brand.