It's not true. In US you pay again incoming calls:
http://gt-sim.de/download/sim/PriceList_eng.pdf
[COLOR="Magenta"]"Working" PrePaids: Wind, Vodafone, CoopVoce, , Travelsim (2), 02 Irish (2)
My best sim?--> Wind +39-328
My phones:
Samsung Galaxy Next S5570