That has nothing to do with the issue. As the OP shows, web traffic is being redirected through a proxy. This creates an issue with logging in to a site, etc. And again, I shouldn't be throttled at all, since I'm not on an unlimited plan, yet I find it odd that it came up (with me) right after hitting the 2GB usage point (I paid for 3.5GB, mobile broadband 4G hotspot plan, NOT a cell phone).
This also hasn't happened in previously months. I think it's a T-Mo network issue, where some users get sent through their proxies by mistake.