AT&T has got to have "some" point at which they limit their users or some would take advantage to the point the network would be unusable for use all. No doubt that you feel that AT&T is mistreating you but a limit has got to be established at some point.
Slowing the top 5% of the bandwidth users down just does not seem that unfair. This means that 95% are using less than YOU are , take it as a hint!
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Sprint is a bottom feeder doing what it can to elevate it's numbers. "Truely Unlimited will NOT last forever. It matters not to me as when I had Sprint I lost service outside of any city. Not going to enjoy unlimited data then!
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You really must be living in a rose garden. Life is not so simple. You need to read your contract again or have someone do it for you and explain what it means.