http://en.wikipedia.org/wiki/Cricket_Communications
Cricket Communications, Inc. founded in 1999, provides wireless services to about 3.84 million customers in parts of 25 US states,[1]. The company is a subsidiary of Leap Wireless, utilizing its CDMA 1X and 1xEV-DO networks. Cricket uses a flat rate billing method, offering rate plans from $25 to $60 per month before taxes by way of month-to-month contracts only; it does not require credit checks or long-term service contracts as other service providers in the U.S. The company recently launched the first Advanced Wireless Services network, in Oklahoma City.
^^There you have it...