Well, that certainly didn't last very long, did it? Looks like Clear is already sending its unusual iSpot product to the great WiMAX network in the sky less than five months after its introduction. As a refresher, the iSpot's claim to fame is that it was designed to work only with iPhones, iPod touches, and iPads -- and in exchange for the crazy restriction, Clear would charge you less than $100 for the hotspot itself and just $25 a month for unlimited 4G access capped at 6Mbps down. Of course, it's easy to understand why Clear would want to forget the iSpot ever existed: its MAC address filtering was easily defeated and plagued with reports that even approved devices were being denied access, suggesting that the concept probably wasn't a solid one in the first place. For what it's worth, Clear retail stores are still selling through remaining stock if you're interested -- and the company will maintain a supply of units for warranty replacements -- but otherwise, you're out of luck.