Ah, the data saga continues. Throttling has been a long-time practice of T-Mobile, which drastically slows data speeds for users who go over their set-amount of high-speed access. AT&T recently announced a similar practice, slowing the top 5% of users who were grandfathered in on unlimited data plans.
Verizon also made a drastic change to its smartphone data packages recently, switching from an unlimited-only offering to a tiered setup. Now, even furthering the changes to its data structuring, Big Red will begin implementing "network optimizations" to all existing customers with unlimited plans on 3G devices in September.