You can download the app for FREE Here
You can read about it on the authors own blog can be seen Here
The only downside I can see is that roaming charges for smart phones such as the iPhone can be very high if you are thinking of taking yours on holiday to Greece. I am also told that activity on Greek repeaters can be scarce. This information was imparted to by two people one of whom is Greek and holds a Greek licence. The other spends two weeks in the country every year and says he has managed only one QSO in the last eight years and that was with a UK holiday maker who only lives 20 miles from his home QTH in England. Maybe this new app will breath new life in to the Greek repeater network. A good job by Christos if it does.