Can think of three places in Magic Kingdom.
One is under railroad station at end of Main Street, near the locker rentals. Second at other end of Main Street on your right going towards Cinderella's castle, round corner from ice cream parlour. And third is near restrooms in alleyway between Adventureland and Frontierland/Liberty Square.
Saw one in Disney-MGM, near restrooms on Hollywood Boulevard, next to the Plant Hollywood Store.
AK and/or Epcot? Didn't see one in October!
All gave free access to Disney sites (you could get sports news from home on ESPN.com) and charged about a dollar-a-minute for access to other sites.
Hope that helps.