Simply put, what plan do you need to be on to activate an iPad as a wi-fi hotspot? My iPad is 4G/LTE with the month to month 5GB data plan. I have an option in Cellular Settings to activate a hotspot, but it also states that there may be additional charges if I do so. Does anyone know if that is the case? One would think that this is easy information to uncover, but I've been looking all over the net for awhile now with no success. AT&T's site is useless for this.