In Greece you should just signal to the waiter. Either raise your hand or do what DJClayeworth said. It is not uncommon for people to ask for extra plates(fries, tzatziki, feta etc.), so they will wait for you to tell them when you are ready to pay the bill. (Also in many restaurants when you signal for the bill they bring a dessert too!)

In Greece you should just signal to the waiter. Either raise your hand or do what DJClayworth said. It is not uncommon for people to ask for extra plates  (fries, tzatziki, feta etc.), so they will wait for you to tell them when you are ready to pay the bill. (Also in many restaurants when you signal for the bill they bring a dessert too!)