I had no money, and found 'Tap4Call'.

The App gives a little credit to call overseas using the Internet. If you download some of the Apps they list and run the App, you get more credit. Some Apps you need to play (I dont, i just download the Apps that give me free credit for downloading them, then i remove the App from my android device. Calls are fairly cheap, Thailand to Australia 2 cents a minute

i've called Australia about 20 times, about 2 hours in total, for free. The connection's not great, but i'm not complaining when getting free international call using just a wifi connection and the internet.

Hope this helps someone who needs to call overseas and like me, had no phone credit at the time.

moved to mobile Internet and devices

/Admin

skype line viber etc all can do wifi calling for a fraction of the price of a real phone call

or even free if both parties have the app