Bet you thought you were pretty slick there, using a tethering app to turn your Android phone into a mobile hot spot while sidestepping the additional carrier charges. What, you thought your carrier wouldn't notice? Well, you're not, they did, and now the free-mobile-hot-spot party is over. So far, AT&T, Verizon, and T-Mobile have all banned access the these apps in their marketplaces. Sprint still allows it but not likely for much longer.