1&1 AG, together with its subsidiaries, operates as a telecommunications provider in Germany. The company operates through Access and 1&1 Mobile Network segments. It provides mobile access and broadband products that include related applications, such as home networks, online storage, telephony, and smart home or international protocol television. The company also offers wireless network services using the network of Telefónica; and 5G mobile network services, as well as develops software solutions. In addition, it provides marketing, sales, logistics, customer, financial controlling, receivables, and risk management services; network planning services; information technology services; and product management services, as well as operates a data center. The company operates under the brand names of 1&1, yourfone, smartmobil.de, winSIM, PremiumSIM, simply, maxim, DeutschlandSIM, sim.de, discoTEL, M2M-Mobil, handyvertrag.de, and RefurbishedHandys.de brands. It serves approximately 11.7 million mobile and 4.1 million broadband customers. The company was founded in 1988 and is headquartered in Montabaur, Germany. 1&1 AG is a subsidiary of United Internet AG.