A bandwidth cap, also known as a band cap or a data cap, limits the transfer of a specified amount of data over a period of time. Internet service providers commonly apply a cap when a channel intended to be shared by many users becomes overloaded, causing a strain on the provider. The provider then charges based on the amount the subscriber goes over. Implementation of a bandwidth cap is sometimes termed a fair access policy, fair usage policy, or usage-based billing.
Maybe? It actually was lol, I got charged 50 for downloading less than 1gb with 3g lel