Per the Terms and Conditions, the cap applies to your total data usage - 3G and 4G combined must be less than 2.5GB or you get speed throttled.
However, people have been reporting that the cap/throttling mechanism for 3G is busted right now - even after consuming much more than 2.5GB of data, they are still at full speed on 3G and 4G. This is making it impossible to know what will happen on 4G if you go over since the whole system is goofed up. (People are also reporting that the online VM USA account page that shows your data usage is showing wrong info like "0 MB used" or bizarro usage like "-646,578 MB used". Clearly something ain't right.)
Although it hasn't been proven by anyone, some think that because the 4G service is provided by Clearwire, there is no mechanism in place to measure and/or throttle down 4G data. If that's true, then you'll be able to go nuts on 4G until the mechanisms necessary to throttle 4G are put into place, assuming that they'll even go to the trouble.
Sorry, but at this point the only answers that people can really give you are speculative. If/when the 3G data cap starts working again, we'll be able to see what happens to 4G speeds when you consume more than 2.5GB of data (3G, 4G or a combo).




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