1&1 AG, together with its subsidiaries, operates as a telecommunications provider in Germany. It operates through two segments, Access and 1&1 Mobile Network. The company provides mobile internet and broadband products, and related applications, such as home networks, online storage, telephony, and smart home or international protocol television. It is also involved in operation of a mobile network based on OPEN RAN technology; and sale of telecommunication devices and accessories. The company provides its products and services under the 1&1, WinSIM, Sim.de, yourfone, smartmobil.de, simply, PremiumSIM, 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.