I'm going to be working/living a facility with ridiculous internet security for a few months. Does anyone know how I can still play on Xbox Live?
Is there a mobile hotspot capable of supporting XBL, and if so, what kind of data plan would I need?
Yes. My home broadband has notoriously bad XBOX Live performace (high pings, dropouts, etc) so I recently got a MiFi dongle and connected the Xbox to that. As long as the dongle has good signal you should be fine.
My dongle (on UK Mobile network 3) has a 15GB monthly limit - a two hour Xbox Live sessions uses around 50MB. I don't use voice chat or do any extra downloads, it's just Halo: Reach matchmaking. I didn't need to open any ports, the Xbox auto-negotiates the connection fine.
Well you need to open the following ports according to this article:
Furthermore you need the WiFi module or a router that acts as a Hub (WiFi to cable).
Problems you could encounter are:
If this is a high security facility I guess this will not work. The admin will not open extra ports so you can play XBox360.