Cosmote is the largest mobile network operator in Greece. The company is headquartered in Athens and is a fully owned subsidiary of the Hellenic Telecommunications Organization (OTE), the incumbent telecommunications provider in Greece. Cosmote has developed business operations in two other SE Europe countries through subsidiaries: Telekom Albania and Telekom Romania, addressing an extended market of 45 million people. In all three countries Cosmote counts approximately 15.6 million customers.