* O2 (owned by Telefónica, merged with rival eplus in 2014/5) A 4th network started in 2023: 1&1 with national roaming on O2 in 2G and 4G/5G. Some 4G and 5G 1&1 stations are already active in specific locations. If you do a network search, and get "262-23", you have 1&1 coverage in your area. All other offers mentioned below are secondary, ethno and discounter market brands, service providers or M