EFF Confirms: T-Mobile’s Binge On Optimization is Just Throttling, Applies Indiscriminately to All Video

Electronic Frontier Foundation finds something shady about T-Mobile’s Binge On program:

The first result of our test confirms that when Binge On is enabled, T-Mobile throttles allHTML5 video streams to around 1.5Mps, even when the phone is capable of downloading at higher speeds, and regardless of whether or not the video provider enrolled in Binge On. This is the case whether the video is being streamed or being downloaded—which means that T-Mobile is artificially reducing the download speeds of customers with Binge On enabled, even if they’re downloading the video to watch later. It also means that videos are being throttled even if they’re being watched or downloaded to another device via a tethered connection.

The second major finding in our tests is that T-Mobile is throttling video downloads even when the filename and HTTP headers (specifically the Content-Type) indicate the file is not a video file. We asked T-Mobile if this means they are looking deeper than TCP and HTTP headers, and identifying video streams by inspecting the content of their customers’ communications, and they told us that they have solutions to detect video-specific protocols/patterns that do not involve the examination of actual content.

Our last finding is that T-Mobile’s video “optimization” doesn’t actually alter or enhance the video stream for delivery to a mobile device over a mobile network in any way. 2 This means T-Mobile’s “optimization” consists entirely of throttling the video stream’s throughput down to 1.5Mbps. If the video is more than 480p and the server sending the video doesn’t have a way to reduce or adapt the bitrate of the video as it’s being streamed, the result is stuttering and uneven streaming—exactly the opposite of the experience T-Mobile claims their “optimization” will have.

T-Mobile gets the credit for disrupting the mobile carrier market, and it has seen subscriber growth because of that. But in light of this finding about its Binge On service, questions arise about the carrier’s reputation and sustainability.


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