1&1 AG is a German telecommunications service and landline and mobile telecommunications provider headquartered in Montabaur, Rhineland-Palatinate and listed on the TecDAX. Since 2017, the majority of the company has belonged to United Internet. At the end of 2021, 1&1 employed 3,167 people and reported revenue of 3.91 billion Euros by the end of the fiscal year. As of 31 December 2021, 1&1 had about 15.4 million customer contracts, 11.2 million of which were for mobile services and 4.2 million for broadband internet. 1&1 Mobilfunk's main competitors are Telekom Deutschland, Telefónica Germany and Vodafone Germany. Wikipedia