Christi Dixon savors the roll-over minutes her mobile phone company recently started offering.

"All of my minutes transfer to the next month," Dixon, who works in marketing in St. Louis, told United Press International. "And on the months that I talk a lot, I avoid all the overage fees."

As recently as two years ago, mobile phone companies gouged consumers, selling them cool technologies, with seemingly cheap monthly plans. Consumers recoiled when they received their phone bills, and were charged huge fees, often two or three times the agreed-upon amount, for exceeding their allotted airtime minutes.

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