Verizon Wireless customers this week noticed that Netflix's speed test tool appears to be capped at 10Mbps, raising fears that the carrier is throttling video streaming on its mobile network.
When contacted by Ars this morning, Verizon acknowledged using a new video optimization system but said it is part of a temporary test and that it did not affect the actual quality of video. The video optimization appears to apply both to unlimited and limited mobile plans.
But some YouTube users are reporting degraded video, saying that using a VPN service can bypass the Verizon throttling. The Federal Communications Commission generally allows mobile carriers to limit video quality as long as the limitations are imposed equally across different video services despite net neutrality rules that outlaw throttling. The net neutrality rules have exceptions for network management.
"We've been doing network testing over the past few days to optimize the performance of video applications on our network," a Verizon spokesperson told Ars. "The testing should be completed shortly. The customer video experience was not affected."
Netflix speed test reveals limit
Our testing appears to back this up in the case of Netflix, though there might be some instances in which users get lower-quality Netflix video, such as when they tether their phone to other devices. On a Verizon Wireless iPhone, we got a 10Mbps download speed on fast.com, which is Netflix's speed test tool. On Ookla's Speedtest app, we got nearly 82Mbps download speeds on the same Verizon LTE network.
But will that actually harm your Netflix video? Probably not, as long as you're watching on your mobile device and not tethering. Netflix says its Ultra HD quality video can require 25Mbps but that's apparently just for non-mobile devices. For mobile devices, Netflix offers a few quality settings, including "Unlimited," which it says "may use 1GB per 20 minutes or more depending on your device and network speeds."