This may not be the best place to post this, but both Conrad and Hilton are extremely inexpensive for calls back to the U.S. Local calls appear to be free.

Hilton is a $S.31 set up per call and $S.39/min

Conrad is the same per minute with no set up charge.

$S.39 is approximately U.S. $.20

Compare that to my T-Mobile international roaming at U.S.$1.49/minute for the same call.

Try to beat that at a U.S. or European hotel for an international call.