How to solve the telephone booth puzzle in Once Human

The Once Human telephone booth puzzle is just one of the many mysteries you'll encounter while out exploring the post-apocalyptic wilderness of the new open-world survival game. You hear a phone ringing, and upon closer investigation, discover the source to be a rundown phone booth. Sure, you can answer the phone and listen to its message, but it doesn't seem to do anything. 

If you've just started playing you might also want to know how to change worlds in Once Human, but otherwise, here's how to solve the phone booth puzzle...