I thought I was pushing it using 70Gb a month but have seen numbers in hundreds. I pay £12.38 a month for 200 calls, unlimited texts. no tethering but it does work. Gets blocked sometimes.
I don't have broadband just use my phone and recently lost a hard drive to a failure with my steam collection all 249 games.
steam games download at 2MB/sec on H+ connection which is as much as I had on 11Meg broadband at old house.