I've used 75 percent of my 50gb high speed data how much would that cost on my bill.

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Dude, it's an unlimited data plan, it's a set (fixed) price no matter how much you use.

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*Note to self: don't bother with detailed explanations when the question is this (cough) basic

It's unless you have a meter to plan, it's not going to cost you anything other than what it usually does.

AT&T got in trouble years ago with the FCC for not informing their customers of when they would be throttled.

AT&T responded by removing the throttle in 2015 and instead switching to deprioritization and most importantly they now inform their customers of when they have reached a certain threshold.

I am guessing that you have the unlimited extra plan. That is an unlimited data plan that is deprioritized at 50 gigabytes. There is no extra charge because it is unlimited data.

Oh thanks so the bill isn't gonna cost anything?

We're here to explain how our high speed data works with our unlimited plans, Jdlechuga.

Thank you all for the useful information.

Since all of our plans include high speed data, you will not be charged regardless how much data you use. When you've used all your high speed data AT&T may temporarily slow data speeds if the network is busy.  However, if you have the Unlimited Premium Plan your high speed data can't slow down based on how much you used.

Let us know if you have any additional questions.

Marilyn, AT&T Community Specialist