www.cosmote.gr Cosmote is the largest mobile network operator in Greece, headquartered in Athens. Although it began its commercial operations five years after its local competitors, Cosmote changed the status radically and dominated the mobile telecommunications in Greece. It is the only company of its sector in the world, which entered the market third and yet managed to become number one in only 3.5 years.
http://www.vodafone.gr/ Vodafone Greece is the Greek subsidiary of Vodafone. Its headquarters are in Halandri - one of the northern suburbs of Athens. Vodafone has the most extensive, technologically advanced and faults and malfunctions resistant mobile telephony network in Greece, able to provide broad coverage by ensuring high-quality communication.