84 percent of U.S. mobile-phone customers are very or somewhat satisfied with their service
Some estimates place the number of U.S. mobile-phone customers at 270 million.
42 percent of mobile customers who wanted to switch service did not do so because they didn’t want to pay an early termination fee
34 percent of mobile-phone customers received unexpected charges on their bills
31 percent had difficulty understanding their bill at least some of the time,
Carriers serving about 94 percent of the postpaid mobile market have prorated early termination fees
There are many choices available for consumers, including options that do not have any early termination fees such as unsubsidized handsets without a contract and a prepaid plan that has no contract. More than 20 percent of American wireless consumers choose these options.
From: http://www.pcworld.com/article/184231/