I'll may actually have a Yackie SIM by the time this trip happens, if it ever does happen. Using a local prepaid with the "free incoming" option, forwarding calls from my VoiceStick number looks like it would be about $0.017/min or someting about the same price as air.
I was just thinking about which, if any, of the Singapore SIMs might be worth keeping active after the trip. Like a Wind SIM, which can be handy even outside Italy. M1 seems to be tied fairly closely to Vodafone.