The Federal Communications Commission has asked Comcast, AT&T, and T-Mobile USA to answer questions about their implementations of "zero-rating," a practice that exempts certain types of content from customers' data caps.
FCC officials wrote to the companies yesterday, pointing out that data cap exemptions can favor some content providers over others, whose content does count against consumers' caps. The letters asked the companies to make "relevant technical and business personnel" available for discussions with FCC staff by January 15.
FCC Chairman Tom Wheeler told reporters today that "this is not an investigation. This is not any enforcement. This is to help us stay informed as to what the practices are, as we said we would do in the Open Internet Order."