Poketalk is being generous this holiday season allowing extra voip calls for free to certain destinations.  Currently there is about 65 destinations that you can call for free.

Limitations for the free voip calling:
Currently voip calls for free are limited to 10 minutes in length.  If you want longer calls you’ll have to buy some credit.

The Holiday Promotion
PokeTalk has decided to double the amount of free voip calls it is offering.  Now users get 100 calls per month from November 24th until December 31st.

Free Voip Destinations with PokeTalk
55 destinations in total.  However, calls can only originate from 10 different countries.