two young-adults prank people. Life does a complete 360 for them pretty quick when…

Two boys rang a woman up, at night and said “your house has been surrounded by the police. Stay where you are, and whatever happens, do not hang up.”
They continue doing this until one day a mysterious man applies their own ways on them. He tells them “Whatever happens, do not hang up, or else you’ll reap what you sow.” He stalks them 24/7.
I hope this is enough information to name the movie.

Genre- Horror