The IP TV application Player it will help you to watch online tv channelfrom all over the world but also from Greece.
This is a FREE application created with the user in mind.
For those who are interested in trying out the application, you can download it from here.
After installation from the application settings you should add M3U lists containing the channels you are interested in. Open Settings and select Manage Channel List.
To find the necessary lists, check here and try downloading the lists by country, or try opening the Playlists by language list.
Have fun!