If you use skype go and download skype again. Don’t ask, just do it (I said download and install not just update!!!). Install this ‘new’ version. You’ll see a new tab called ‘Dial’.
Go to your skype account, take your credit card and buy some skype credits.
Go to the skype client and simply dial a oversea number with international access code.
For example you can call the USA for 0.014 Euro a minute.