voice actors
Some of them just weren't very good actors; they sounded way too fake. And I don't know why anyone thought it was a good idea to use the same actors as different callers! I found that very distracting, to hear the same voice as a different person, especially with people such as Earl Hindman and Park Overall, who have very distinct voices. It really detracted from what they were saying, and if you're taken out of what people in this movie are saying, you're out of the movie, because that's all it is, is people talking. If they'd used some better voice actors, and more of them, the movie could have been much stronger.
http://moviesonthemind.blogspot.com/