I've been using a calling card, and trying to research the best bang for the buck, but there are so damn many. For those of you who use them how do you decide or do you just pick one that looks the best at the time?  I use mine for US calls and calls to Canada, but damn I want a deal but the homework times the number of options is huge. I currently use DMV or Tri-State with no connection fee how about any of you.

I use the ATT one that I get from Sam's club don't know if its the best but have has some that wouldn't work outside the U.S.A.