Watch out, Sprint (S): AT&T (T) hasn’t forgotten the role you played in wrecking its proposed merger with T-Mobile. And now that Sprint is engaging in a series of mergers of its own, first with Japanese wireless company Softbank (SFTBY) and then with longtime partner Clearwire (CLWR), AT&T has decided to complain loudly about its rival’s newfound love for industry consolidation. As The Hill reports, AT&T spokesman Brad Burns warned this week that “Softbank’s acquisition of Sprint and the control it gains over Clearwire will give one of Japan’s largest wireless companies control of significantly more U.S. wireless spectrum than any other company.” Burns went on to say that AT&T expected that Sprint’s newfound position of spectrum dominance “will be fully explored in the regulatory review process.”