O2 Telefónica is a leading full-service provider of telecommunications services for private and business customers. In addition to traditional telephony and internet connections, the portfolio of its core brand O2 and various secondary and partner brands also includes innovative digital services in the area of IoT and data analysis. In mobile communications, O2 Telefónica manages over 45 million mobile lines (incl. M2M – as of 31 December 2023). No network provider connects more people in this country. The company’s high-performance, award-winning mobile network reaches over 99% of the population. O2 Telefónica’s landline network offers its customers the greatest technological diversity and territorial availability of all providers in Germany. In the 2023 financial year, the company generated sales of €8.6bn and employed around 7,500 people. The company is majority-owned by the Spanish telecommunications group Telefónica S.A., which is based in Madrid and one of the largest telecommunications groups in the world.