Since forever i can recall the frustration of foreign tourists and their encounters with Athenian taxis, here comes technology to answer the problem. Taxibeat is an Apple application(also available on android) that embeds a rating system for taxi drivers with reviews from other users etc.
It is very convenient to use, requires an internet or 3G connection (highly suggested that tourists buy prepaid mobile internet cards from Germanos or Vodafone stores) and allows you by using your GPS signal to locate and “click-call” a near-by available taxi, that easy!!
Be sure to give it a try on your next visit to Athens!! 🙂