Those red phone booths in the UK in Epcot...?
Did you know you can actually CALL them? I was on another message board and discovered this! Apparently, if no one picks up after about six or seven rings, it goes to a fax machine type of noise, but it's worth a try! Or, you can always play a trick on people who go to pose in the booths for a photo op! ;)
The number is 407-827-9863 and it's for the center booth. Good luck and report back here if you get an answer!
Two other numbers you can try:
407-827-9861
407-827-9862
ETA: Just tried and got someone on the 9863#! It's hilarious!