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Mobile carriers throttle online videos almost all the time, study says – CNET

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August 19, 2019
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Mobile carriers throttle online videos almost all the time, study says     – CNET
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YouTube is throttled the most, according to a new study.

Angela Lang/CNET

Wireless carriers have long said they may throttle, or slow down, data when mobile networks are congested, but a new study suggests your video viewing might be getting slowed down even when networks aren't overcrowded. Researchers at Northeastern University and University of Massachusetts Amherst found that carriers throttle online video whether their mobile networks are congested or not. Location and time of day also appeared to have little impact, the researchers said.

All four main carriers — AT&T, Sprint, T-Mobile and Verizon — were found to be throttling, according to the study, released Monday. The researchers collected data from more than 600,000 tests in the US using the Wehe app, which measures if provider is throttling speeds, between January 2018 and January 2019. Globally, they collected data from more than 1 million tests.

When it comes to specific video apps, YouTube was throttled most often and Vimeo was the least throttled, according to the study. AT&T, Sprint, T-Mobile and Verizon all throttled YouTube and Netflix, the researchers said. T-Mobile, Sprint and Verizon also all throttled Amazon Prime Video.

"They are doing it all the time, 24/7, and it's not based on networks being overloaded," David Choffnes, associate professor at Northeastern University and one of the study authors, told Bloomberg.

AT&T said it doesn't throttle, discriminate, or degrade network performance based on content.

"We offer customers choice, including speeds and features to manage their data," AT&T spokesman Jim Greer said in an emailed statement. "This (Wehe) app fails to account for a user's choice of settings or plan that may affect speeds. We've previously been in contact with the app developers to discuss how they can improve their app's performance."

Verizon, T-Mobile and Sprint didn't immediately respond to a request for commRead More – Source

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