BARCELONA, Spain, Feb 28 The European Commission should help telecoms companies whose revenues it has eroded through consumer-friendly regulation by allowing more mergers to help them to build scale and boost investment, the CEOs of Vodafone and Orange said on Tuesday. European regulators are still underestimating how the present framework hinders the capacity of telecoms operators to sustain investment, unlike the regulatory landscape enjoyed by their U.S. peers, the carriers argue.