The Antitrust Division of the U.S. Department of Justice (“DOJ”) has concluded an inquiry into whether larger commercial wireless carriers colluded to increase text messaging rates. The inquiry apparently was triggered by concerns raised by Senator Herb Kohl (D-WI), the chairman of the Senate Judiciary Committee’s antitrust, competition policy, and consumer rights subcommittee, who held a hearing earlier last year on text messaging rates. Senator Kohl subsequently sent a letter to the FCC and DOJ asking them “to take action to ensure that the wireless telephone market is open to competition, and to remove undue barriers to entry and expansion by new competitors.” According to the FCC, it is still looking at various other issues identified in Senator Kohl’s letter, including early termination fees, exclusive handset arrangements, roaming, and special access.