Kohl's office is asking each carrier to explain the method behind the text message rate madness, including any cost, technical, or other factors that justify the 100 percent increase between 2005 to 2008. Kohl also wants data on how text messages are utilized, comparisons of how text message packages stack up against competitors, and—perhaps most importantly—price comparisons against per-minute charges for voice plans, and per-KB charges for mobile Internet and tethering plans. It should be fun to hear AT&T defend why it charges over $1,300 per megabyte for text messages.