I haven't watched the original and didn't know it was a remake until I read a couple of reviews.
The guilty is an ok movie, but the problem is the lack of scenes outside the phone center and lack of interactions with other character apart from voice characters. I don't know if they wanted to prove the point that you can make a movie with the camera pointed at one actor for a whole movie or if they were short of budget but the fact is that after a while it becomes tedious to watch. Different locations with different actors would have made the film much more watchable even if they wouldn't have added much to the story.
The guilty is an ok movie, but the problem is the lack of scenes outside the phone center and lack of interactions with other character apart from voice characters. I don't know if they wanted to prove the point that you can make a movie with the camera pointed at one actor for a whole movie or if they were short of budget but the fact is that after a while it becomes tedious to watch. Different locations with different actors would have made the film much more watchable even if they wouldn't have added much to the story.