What version of the bible do Greek speaking Christians use?

Do Greek speaking Christians still use the Septuagint and original New Testament text? Or do they have a "modern Greek translation"? I ask because the New Testament is 2000 years old, presumably the Greek language has changed and evolved a lot in that time and so the original NT might not even be understandable to a modern Greek speaker. I'm interested in what Greek speaking Christians use in general (Catholics, Orthodox, Protestant), but I'm also very interested in the Greek Orthodox church in particular. I'm curious what version of the scriptures they draw upon in their liturgy: the originals? or a modern paraphrase/translation?