A couple of months back I did the technical help chat, because I was getting crazy slow data, I assumed a tower was down (that happens on occasion). After looking at the towers, and then my plan she said I was actually being throttled. I asked why I didn't get a notification and she said "You did get a notification, on Sept 14th". This seemed crazy since it was June. When I called her out on it, she explained further "Sept 14th, 2012. That is the only warning you will receive. Any time in the future you are throttled, you won't be notified you will just be throttled."
I was obviously furious at this and called her out on it being unfair, deceptive, ect. I asked said it wasn't fair to not get a quick text notification every month when throttling starts. She said that wasn't within AT&T's capabilities. They could only send the initial message but their systems were never to set up to send a text every month an unlimited costumer was throttled.
I told her that was BS, because if they couldn't send the message every month they shouldn't be able to throttle and that it shouldn't be hard to have a program set up to send the txt when "throttle=on" occurs. And that it was BS that they couldn't send the message because when my wife on a 2gb plan gets a warning at1.7gb and at 2.0 gb, I know they can send it.
Basically the short story is a rep lied to me, telling me a monthly throttle notification warning was beyond their capabilities. AT&T is filled with liars and cheats and I plan to switch to Verizon prior to the iPhone 6S release. They may be no better, but AT&T is terrible and their speeds are slow even without throttling.