Think how nice it is to have an unlimited cellular data plan. All the major carriers have such a plan. But the ATT unlimited data plan works well – until you use it.
Once ATT decides you have become one of the heaviest users, i.e. the top 5% of data users, ATT will throttle their speed by as much as 99%. It would make the smart phone essentially useless.
ATT wants to push users toward using WIFI instead of cellular.
It must mean that ATT is adopting that old business maxim, “over promise. under deliver.