Actually he might not pick up, if you call him. For a various amount of reasons that is. One of them is he is reluctant to just help people as is evident in the movie. Not just anyone that is. So while he sees dead people (where have you heard that before?), it is more than that. He also does more than talk to them, if the situation requires that.

It's quite the weird movie. While it does seem to be conventional at places (rhythm, spacing, pacing and of course story and twist wise), the ending is quite something. It's like an add on, which might make sense to some and might completely take others out of the movie. Whatever the case is, this is nicely done and the effects are decent