An awesome one here to prank. There's nearly always a queue of local taxis waiting her for a job. Calling the number makes the box at the rank ring. The driver of the first taxi will spring to get out and answer it.
Below is a world day/night zone image. It will help you time your calls to payphones across the globe.
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Please send me an email regarding anything related to payphones. My email address is provided on this page, which also contains information on how to contribute your own payphone pictures.