A few years ago my brother would get a call on his cellphone around 2:00 - 3:00 A.M. every night. He would answer and it was this hellish sounding noise. Like static mixed with screams. He changed his cell number after a month of this and it stopped.
Then after a week or so it began again. The exact same noise. Exact same time. Finally one day he decided to backdial the call. It was an old man that had no clue what he was talking about. Still the calls persisted. If he didn't answer, it would call a few more times. No messages were left.
He decided to say screw it. Ended his contract with his phone company, switched to a new one, and then got another new number. You guessed it, the screaming static calls continued after a short delay. By this time he was terrified every night. Unsure why this was happening. He backdialed the number again and got a different person.
Around this time he lost his job and his phone. The calls stopped of course. His phone was disconnected now. So one day my mom asks me to listen to this weird message she got on our home phone.
It was the static screaming. We showed my brother and he was freaking out. He backdialed the number again and it said the number was disconnected this time.
Never heard from it again after that.