Network
Telefónica Germany operates its own mobile network. On 1 October 1998, VIAG Interkom, the predecessor of Telefónica Germany, started network operation in eight German cities, among them Munich, Berlin and Hanover.[27] After the merger with E-Plus in 2014, Telefónica Germany finalized the integration of the O2 and E-Plus networks into one singular network in August 2017, eliminating the need for National Roaming between the networks.[28] In October 2020, Telefónica Germany started operation of its 5G network in the five largest German cities Berlin, Hamburg, Munich, Frankfurt and Cologne.[29]
By the end of 2025, the network consists of 29.000 network sites across Germany.[4] The company currently offers GSM, LTE and 5G technology in its network and achieves a population coverage of nearly 100 percent for GSM and LTE technologies, and 99 percent for 5G, respectively.[30] 3G technology has been phased out of the network by the end of 2021. The spectrum has been subsequently repurposed for more modern LTE connectivity.[31]
At the latest 5G frequency auction, held mid-2019, Telefónica Germany acquired new frequencies worth €1.42 billion.[32] The following year, the frequencies in the 800 MHz, 1,800 MHz, and 2,600 MHz frequency ranges were prolonged by the German Federal Network Agency until December 2030, free of charge.[32]
In April 2016 Telefónica announced the sale of 2,350 mobile sites to tower company Telxius for €587 million, followed by the sale of an additional 10,100 sites in June 2020 for €1.5 billion.[33][34] In January 2021, the Spanish Telefónica group announced the sale of its subsidiary Telxius Telecom S.A. to American Towers for €7.7 billion. The sale included roughly 30,700 tower sites, including the recently purchased German sites.[35]
Both during and after the finalization of the network integration, the network quality has been subject to repeated criticism.[36][37] In the 2020 mobile network test conducted by trade magazine Connect, the network received a “very good” rating for the first time.[38] Since 2020, the network of Telefónica Germany has been rated "very good" every year, most recently in November 2025.[39] In addition, the network achieved a joint second place in the overall ranking for the first time, tied with Vodafone.[39] Also in 2025, the network achieved a “very good” rating for the first time in CHIP magazine's mobile network test.[40]