I used to have Sprint Wireless and I asked about a wireless broadband package. They said they currently did not offer any, but AT&T did. The AT&T wireless broadband service is about as fast as ISDN and runs something like $30 a month for 15-20 GB of bandwidth. It has a pretty wide coverage area also.
Are you talking about the EDGE service(3G). That is a little different as it is cellular service. Sprint currently offers the same and is concentrating on expanding it. But my understanding is that the Cellular companies will adopt WiMAX as a 4G cell phone internet service.