AT&T announced in October of 2011 that they would begin throttling data usage for users still on an Unlimited Data Plan. Original iPhone users are the only one who have kept their unlimited plans, while newer customers on AT&T have been stuck using tiered data plans, which were just restructured last month.
In October's announcement, AT&T said they will only throttle the top 5% of data users. AT&T warns users that they will be throttled when they fall under that tier, usually passing more than 10GB of data for the month. However, things didn't seem to go that way for blogger John Cozen who only used 2GB of data before getting the notification. Cozen reached out to AT&T upset, who then responded..