1&1 AG, together with its subsidiaries, operates as a telecommunications provider in Germany. The company operates through two segments, Access and 1&1 Mobile Network. The company provides mobile internet and broadband products that include related applications, such as home networks, online storage, telephony, and smart home or international protocol television. It also offers wireless network services using the network of Telefónica; 5G mobile network services; and telecommunication devices and accessories, as well as operates data centers. The company provides its products and services under the 1&1, yourfone, smartmobil.de, WinSIM, PremiumSIM, simply, and DeutschlandSIM brand names. The company was founded in 1988 and is headquartered in Montabaur, Germany. 1&1 AG is a subsidiary of United Internet AG.