1&1 AG is a German telecommunications service provider headquartered in Montabaur, Rhineland-Palatinate and listed on the TecDAX. Since 2017, the majority of the company has belonged to United Internet, and offers both mobile and landline services. At the end of 2021, 1&1 employed 3,167 people and reported profits 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. Wikipedia