Not any longer. AT&T revised its soft caps in March. For grandfathered unlimited users on a 3G or HSPA+ device, the soft cap kicks in at 3GB; LTE users see the soft cap at 5GB.[0] Provided a subscriber is using the LTE version of the unlimited plan[1], he or she makes out better than the current $30 offering, which is 3GB regardless of device.
1 - The same soft cap applies even if a subscriber is in a non-LTE area or using a non-LTE device, but has at some point activated an LTE device. The differentiation is the plan. Activating an LTE device with grandfathered unlimited will put the LTE version of unlimited on the account, even if the subscriber lives in an area where LTE is not yet offered.
