AT&T users report getting throttled at 2GB despite 'unlimited' data plans

If you're an old-school iPhone user who still has one of AT&T's unlimited data plans, be prepared for a rude awakening. Some AT&T customers have reported that they are getting knocked from 3G speeds down to 2G speeds after they exceeded 2GB of data consumption per month despite having grandfathered-in unlimited data plans from the carrier.

Blogger John Cozen wrote a detailed post this weekend describing his attempts to get AT&T to justify throttling his data speeds despite the fact that he had only consumed 2.1GB of data on the month. AT&T representatives told Cozen that the carrier begins throttling users' data speeds if they are among the top 5% of data users among users with unlimited plans. In other words, if the top 5% of data users consume 2GB of data or more on their unlimited plans, then they get their service reduced for exceeding 2GB, despite the fact that AT&T offers users tiered data plans that charge $30 a month for 3GB of data.