Yep supacabby, go to shop. Like Keith said, I firs signed up the the uk Landline contract when it was 17 pounds per year. This was to phone any landline.
Now I also keep a credit of 5 euros from direct debit to call mobiles and phones worlwide. (It helps when looking for employment)
We have been abroad for around 30 years and skype has probably saved us the cost of a house. Now in Fethiye with a dongle but can still do several one hour calls.