Prank calls to the world...
I lasted less than a minute.
There's a lot more to prank phone calls than simply reciting prepared material of a not-very-funny and potentially offensive nature at the person who answers the phone.
Google 'Fonejacker' for examples of how it should be done.
You don't know what you're doing. Learn more - a lot more
Following on from both your replies, I never found any of it funny... I think your ten years to late.