I tihnk Wind (in Italy) and Yoigo (in Spain) are the best solution.
The best tariff of Wind (for short calls) is Wind Super Senza Scatto--> 0,17 euro/minute without set-up fee (0,12 euro/sms). Sim card costs 10 euro (with 5 euro in).
http://www.wind.it/it/tariffe/index.phtml?sHp2=4066
Here--->
http://www.prepaidgsm.net/en/spagna/yoigo.html Yoigo tariffs
[COLOR="Magenta"]"Working" PrePaids: Wind, Vodafone, CoopVoce, , Travelsim (2), 02 Irish (2)
My best sim?--> Wind +39-328
My phones:
Samsung Galaxy Next S5570