Where can I find out my monthly internet usage?
#1 There is no cap, as far as I know for DSL,
For FIOS, I point to http://www.dslreports.com/shownews/125634
#2 Get your own RJ-45 WAN port that can tell you how much data is used and depending on you modem follow http://www.dslreports.com/faq/13600
