I recently heard about a new service, tried it, and it worked. I thought I should share it with others too. The service is called Manifree, it allows me to place calls abroad for free, once every day. The number of free minutes depends on the destination, but you can get up to 30 mins free talk every day. It works like this: go to their website, type the number you wish to call, and choose how you want to place your call (through callback or direct call). After these steps you can use your regular phone to talk. It is free to try, so why not do it
I hope this helps people who pay massive phone bills.