The U.S. Senate’s top antitrust watchdog is asking the nation’s leading wireless companies why they have recently doubled their charges for text messages. Sen. Herb Kohl (D-WI), chairman of the Senate Antitrust Subcommittee, has sent a letter to the presidents and chief executive officers of the four largest U.S. wireless telephone companies asking them to justify sharply rising rates for customers to send and receive text messages. Kohl’s letter requested an explanation from Verizon Wireless, AT&T, Sprint and T-Mobile, which collectively serve more than 90 percent of the nation's cellular phone users.
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