So right now I'm grandfathered onto AT&T unlimited data, and it appears to be popular opinion that having unlimited is a good thing. However, I'm thinking of going to the 4GB plan to take advantage of tethering... just as an option. I suppose there's no going back though. I also carry around a Verizon LTE mifi/hotspot (work pays for both), but it would be nice to have a GSM hotspot option. Would it be foolish to give up my unlimited AT&T plan?