Even most of the real VOIP (SIP) services are not cheap enough in my opinion :(
Skype is obviously the best though if you have a computer at both ends, when we had PLDT in the condo in Manila it was great but we are stuck with a SmartBro 3G modem in our current place because PLDT are to dumb to be able to keep a customer that moves house
The SmartBro still incurrs costs but it's only something like 30 peso an hour, I forget now need to look it up
Jim