It is frustrating that people lose the grandfathered unlimited plan when they upgrade. However I am a heavy user and only have the 6GB plan and its more than enough so unlimited data is not necessary. I understand you wouldn't want to keep track of your data usage but it is pretty easy to do with notification preferences and the ability to backdate the plan if you go over. The only major carrier that has "truely unlimited data" is Sprint and the Verizon network is far superior. It would be a shame to switch to a much less reliable network just because you think you need unlimited data.