
I saw this at an Italian film festival past week...surprisingly great. 100% diolague driven but the acting was superb and even in subtitles I wasn't taken out of it. Great plot and twists and for a film that takes place in a single room that's tough to pull off.
Non spoiler plot: a group of friends are having a dinner party and they discuss how well they know eachother... so well, that they should (as a game) put their phones in the middle of the table and read any text, speaker any call, etc that they get...

This movie was great; really, really well acted. A solid A- at worst.