Does anyone have opinions about this US operation from IDT? - it started recently, mainly aimed at the Hispanic market
http://www.tuyo.com/default.aspx?lang=en
One option is 10c per minute calls, with 10c connection fee, options like calling card. Or 20c for 1st 10 min, then 10c.
And a $5 a month bonus top-up scheme for the next few weeks ...