It was a quirk of the TBolt radio... All LTE On/Off does is open up the advanced radio menu that you can get into by dialing some long number in the dialer (I forget what it is now)... The reason it was a must have app on the TBolt is because it was the only way to turn off LTE on that phone (unless a dev put it into their ROM). On the Nexus you can do the same thing by simply going into the Data settings in the Settings menu.