Sully's revelations on the phone calls and Horace Belfin foreshadow that the calls are not a true miracle. The phone calls always occur on Fridays, and Horace takes off from work on Fridays. Horace is ex-military and used to work with wiretraps and phone intercepts. This means that he has the ability and knowledge to create a fake call from heaven. Horace also sits in on all of the meetings with the families of the deceased. All of these things foreshadow that the calls are all a hoax.
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