In a conference call next Monday, Clearwire is expected to detail a "pay as you go" mobile data service. The service would use Clearwire's 4G WiMAX network, and may have a tie in for Sprint 3G data. Sprint is the majority owner of Clearwire. The monthly cost is currently unknown. These details were gleaned from an SEC filing late this afternoon.
Sprint has begun using the faster data standard in several phones, including the Evo 4G and Epic 4G. Presumably, this contract-free service would be based around data cards, but a MiFi-like device is not out of the question (maybe a re-branded Sprint Overdrive). Customers would likely have to pay the full price for their data modem, though.
WiMAX coverage is still limited, and the 2500MHz frequency in use means it tends not to penetrate buildings very well. But users with good signal can get several megabits down. How much would you pay for contract-free 4G data service?