The Betamax/Finarea/Dellmont group has been in business for a least 10 years. It has been working very well for me for the past 7 years (from home phones, Mobile, on the way using hotel phones, etc...).
To make it very simple here is the procedure to get going:
- choose the provider that best fits your rates for the countries you need: Call rates comparison table
- make an account on the provider's website (add .com to the name)
- charge 10€ credit
- install https://play.google.com/store/apps/d...rea.MobileVoip (or for iphone get it from the iphone market).
And start saving big while calling.
edit: call quality can be a little lower than a direct call from time to time depending on the countries. But with such rates I think there's nothing to complain about.