I always see people referencing their 4G or 3G connection as "full" or "1 bar", "2 Bars", "3 Bars", etc. I've always thought that the Signal Strength Bars are for voice signal and has nothing to do with Data Signal. For data signal you either have it or you don't, 4G, 3G, 1X. There is no strength meter. Can someone confirm this or correct me please. It's so widely used that it has me doubting myself.