also known as "crank call"
A call you make to a stranger in which you say random things.

A telephone call to a stranger...business, or even a friend. The point is to cause confusion and anger, or just to let out some pent up energy or boredom. Usually people will get angry and hang up when you start annoying them, if you keep calling them back to back, that will get some laughs :D a common response is "Who is this?!?" and "You've got the wroung number!"
many accounts on YouTube have celebrity soundboard prank call to random people.

see Bart Simpson and Donald Trump

the reason i unhook my phone every night, fuckers