Nope, never did any myself, but I've surely heard of a few good ones.
Our current "prank" is the way David answers the phone. If you call our house and hear, "This is me. Is that you?", you'll know David's there. He did that today to a person from another country (which shall remain nameless), a rep for Bellsouth, and the poor person did not know how to reply. That one wasn't on her flowchart.
My brother Mike and some of his friends were excellent at phone pranking. One time they kept the 411 operator occupied for quite a while, trying to get a phone number and address for a friend--they claimed to not know the last name or address, except "down the road from ---". Used to be, long time ago, you didn't get in trouble for stuff like that. Mike had all the fun I wanted to have when I was a child.
The girls (and most of my readers know who I mean) used to call infomercials to ask about products. The younger one once called a 12 step plan and said she didn't have enough money to buy the whole plan, but did they have a six step one? She might could afford that. There were a lot more details, but those ought to be enough to get your memories flowing about the stuff you did. Love you all, and God bless.