Clear iSpot is a wireless Internet access service designed for Apple iPhone, iPod Touch and iPad. The iSpot creates a local WiFi hotspot, and connects to Clear's 4G wireless cell phone service. The iSpot can support up to 8 iDevices simultaneously.
At $25 a month for unlimited data transfers, iSpot is inexpensive compared to WiFi hotspot service offered by other cell phone providers. And the iSpot service can be turned on and off on a monthly basis. The iSpot service requires an initial hardware purchase of $100.
Here's the web page that describes Clear iSpot
http://www.clear.com/shop/services/mobile/?id=360&market=79
Clear service is limited across USA. At this writing, 55 metro areas are included. Use this page to see if service is available in your area.
http://www.clear.com/coverage
Note that the iSpot is 4G only. Clear has other devices that can connect to 3G service (usually by Sprint) when you're in an area where 4G is not available. Clear calls this service Internet+, and charges $50 a month for service for a single PC (no Mac support).
It's unclear to me how the iSpot WiFi device tells the difference between Apple iDevices and other computers. Some early adopters report that the MacBook and MacBook Pro laptops can use the iSpot, too. It's relatively easy to spoof your computer's network hardware address (sometimes called the Media Access Control, or MAC, address) so a laptop would look like an iPad to the iSpot. Hmmmm.
Clear gives you a two week trial period with the new service. They will refund your money if you're not satisfied.
Background:
Clearwire is a company that provides data communication services. Their wireless division is called Clear. Clear offers wireless Internet access in 49 metro areas across USA, with more on the way.
The Clear service is based on WIMAX technology, which is described as 4G, fourth generation wireless. Clear WIMAX offers a maximum of 6 Megabits per second when downloading, 1 Megabit per second when uploading. These speeds are under ideal conditions. In the real world, speeds are lower, but tend to be at least somewhat faster than 3G service.