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New prepaid cell phone subscribers accounted for nearly two thirds (65 percent) of the 4.2 million net subscribers added by U.S. phone carriers in the fourth quarter of 2009.
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The prepaid segment of the wireless market grew by 17 percent in the 4th quarter of 2009 to 54.4 million subscribers, up from 46.3 million in the same quarter in 2008. By contrast, contract-based cell phone service grew only 3 percent over the same period of time.
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One out of five cell phone subscribers are now using prepaid phones. The prepaid segment represents a larger proportion of subscribers in the US than ever before, hitting 20 percent in the 4th quarter of 2009, up from 18 percent at the end of 2008.
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Overall, there were 285 million wireless subscribers in the U.S. at the end of 2009.

From: http://newmillenniumresearch.org/news/033110_prepaid_trends_news_release.pdf and http://www.dailywireless.org/2010/04/05/prepaid-subs-beat-postpaid/