Telefonica Deutschland, Germany’s largest mobile operator by subscribers, says it will begin offering on-net rates for calls, SMS and MMS between its own brands and partner brands, including O2, E-Plus, BASE, Ay Yildiz and Ortel Mobile. The move, which will come into effect on 14 March, is part of ongoing efforts to integrate Telefonica’s network and brand portfolio, following its acquisition of rival wireless operator E-Plus in October 2014.