Sen. Herb Kohl, chair of the antitrust subcommittee, sent a letter to the four major U.S. wireless firms, AT&T, Sprint, T-Mobile and Verizon Wireless. The letter expressed his concerns that the rates for sending text messages has doubled over the last three years to 20 cents, while the cost of sending them has not increased. Senator Kohl is formally requesting the network operators to explain the reasons for the price increases and to justify them compared to the rates of sending / receiving emails and other services. The network operators have yet to respond.

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