It’s beginning to look like wireless carriers have wildly conflicting ideas on what “unlimited” means with regards to their unlimited data plans. The latest of these is Comcast with its Xfinity Mobile MVNO service, which piggybacks on America’s largest 4G LTE wireless network: Verizon Wireless. 
For starters, streaming video on Xfinity Mobile

Source: Hot Hardware – Comcast Cripples Xfinity Mobile Phone Service With 480p Video And Pathetic Hotspot Speeds