Two major studies released this week of the nation’s largest wireless networks put Verizon Wireless on top in nearly every technical network measurement, with AT&T close behind and Sprint and T-Mobile trailing. The studies by JDPower and RootMetrics point to the nationwide wireless dominance of Verizon and AT&T, which serve a combined two-thirds of all subscribers. The two studies might arguably give federal regulators a technology rationale to allow Sprint, the third-largest U.S. wireless carrier, to merge with fourth-place T-Mobile, as Sprint’s parent company SoftBank of Japan clearly desires. A profile of SoftBank Chief Executive Masayoshi Son in the Wall Street Journal reports that he is working on a bid for T-Mobile despite strong opposition by U.S. antitrust officials, who are concerned with reduced competition. It was the Justice Department that rejected AT&T’s offer to buy T-Mobile in late 2012.