Well some people say it's about 150GB and other people say upto 500GB is just fine. Thing is actual FUP figure is not clearly stated on thier T&C. I usually do 120-150GB per month and they don't complain at all though.
Or you mean traffic control/shaping stuff? If that's what you meant then there's non as far as I'm concerned. You get full speed at anytime of the day and no applications I've tried so far are being throttled. No idea about port restriction policy sorry.