The phone booth was on the north side of the canyon on the Kaibab Trail. I remember the phone cable was lying on the ground and went straight up the canyon to the rim while the Trail switchbacked up and down.We went the opposite direction... we hiked down the South Kaibab trail and out by the Bright Angel trail... took 3 days to hike it. That was in 1988...
I don't remember a phone booth... but I was 15 years old at the time. That's been a couple of weeks ago...
-Bear