1&1 AG engages in the provision of telecommunication services. The firm's services include postpaid and prepaid, landline and DSL products, and related applications such as home networking, online storage, telephony, video on demand, and others. It operates through the Access and 1&1 Mobile Network segments. The Access segment offers internet access products based on landline and mobile networks. The 1&1 Mobile Network segment focuses on operation and ongoing expansion of the mobile communications network. The company was founded by Ralph Dommermuth in 1997 and is headquartered in Montabaur, Germany.