In May of last year, our free ride came to an end. US carriers started blocking third party tethering apps in the Android Market. Not long after, the built in feature was turned off on many phones. Our fortune may be reversing, however. The FCC has ruled that Verizon violated the rules governing the C Block of LTE spectrum by preventing consumers from using any application of their choice. The end result: Big Red will have to open up its airwaves and allow customers to circumvent its $20 a month tethering plan using apps from the Play store -- so long as you're on a "usage-based pricing plan." Thou