I've been an iPhone user since the iPhone 3 and I currently have the iPhone 4 in Columbus, OH. Neither AT&T or Sprint have 4G LTE here yet. Only Verizon has it but I'm not really looking to switch to Verizon due to the cost and plan structure. I do currently have the grandfathered "unlimited" data from AT&T so I'm debating on staying with AT&T or switching to Sprint to take advantage of a family plan with my girlfriend. Since nobody knows when 4G LTE will be rolled out in Columbus for either carrier, what type of performance should I expect? Will there be any performance lift from their current 4G networks versus the 3G I currently have? Anyone have any insight on when Columbus could get the LTE from either carrier?