The merger was delayed because of concerns by the European Commission on reduced competition in the German mobile market.

In July 2014, the European Commission approved the merger, conditional on E-Plus giving up some frequencies and network capacity.

In February 2006, after the EGSM900-band, which was in military use before, had become available in late 2005, the German regulation authority Federal Network Agency assigned two 2 x 5 MHz channels to E-Plus and O2 Germany.

In March 2007 E-Plus outsourced deployment, management and maintenance of its network to Alcatel-Lucent and thereby transferred 750 employees to the latter company.

E-Plus provides network access to numerous virtual operators, such as Base, Blau Mobilfunk, ALDI Talk, Simyo, VIVA, JambaSIM.

It also owns and operates AY YILDIZ, a mobile brand aimed at the Turks in Germany, offering affordable calls to Turkey and roaming in Turkish networks.