how do you get back when someone prank calls you?
I usually figure out if the phone is a mobile, if so i text bomb
if its not, i post it online (the number)

I don't answer the phone when I don't know the number.

I just shrug it off and go on with my life.

this

I go along with it and then the pranker becomes my victim instead.

I don't remember the last time I got prank called.

Same here. If they think it's important they can leave a voice mail, and I'll call them back if I think it's important.

The real question should be "What do you do when some wrong number texts you?"

When that happens I usually go along with whatever it is for a bit and then tell them it's a wrong number.

Example:

Wrong Number: Why do u need the weekend off?

Me: Because it takes me that long to bury the body.

WN: Funny

Me: I tend to think so.

WN: Unless someone is on vacation i usually do not schedule anyone the whole weekend off

Me: Maybe you don't, but you have the wrong number. (At this point I realize that this is someone's boss, and, not wanting to get them fired, fess up)

WN: Sorry

(End conversation)

Oh, and one time this Manhattan area code kept sending me pictures of shoes, and nothing else, (Seriously, like thirty pictures) in what looked like the back room of a Footlocker. So I started sending him pictures of shoes back, some being worn by other people.