Verizon may be using Deep Packet Inspection to detect and throttle Video services and possibly VPN's used to bypass the cap.

[DarkSpace-Harbinger 11]

If you are using Verizon, i would recommend immediately setting up an SSL tunnel if you are using Android via this guide

 

Verizon Adds Video Hard Caps, Throttles all customers on both limited and unlimited plans (separate purchase now required for HD video)

 

Possible use of Deep Packet Inspection to identify and throttle video streams and throttle VPN's used to bypass new video traffic discrimination

[willieaames 3]

I expect AT&T to lurk and attempt to follow this within a month after watching the Verizon backlash.

[OmniNegro 155]

Sadly there has been basically zero outcry about this illegal throttle. (The throttle itself is legal, but enforcement requires them to break secure connections, and that is a crime in all parts of America for any purpose other than law enforcement, and even then a warrant is required.)