Yeah, I know there are other posts about the phones, but I got a picture to share!
I finally found one of these phones that plays a prerecorded conversation. I asked a CM early in the day and she said they are only at Disneyland, but I've read so much about these being at Disney World. Later a very friendly CM around the Jungle Cruise area confirmed they indeed did exist and told us about this one.
As you head towards the castle on Main St. you will come to a little alleyway on the right after VMK Central. There's nothing in the alley but shop windows and entrances. As you turn right into the alley, turn left into a doorway to the Mercantile (I think it was called) and just next to the register is one of these phones. The cashier looked at me like I was nuts as I had this picture taken.
WARNING, the message is VERY loud. It's a conversation about the kind of things people could find in a turn-of-the-century mercantile, a very fitting Disney ambience thing. VERY COOL. In fact every few moments you could hear a phone ringing, sort of beckoning you to pick it up like the Indiana Jones water well at MGM with all the signs saying, "DO NOT PULL THE ROPE."