+15738749709, Payphone at Hickman High School, Columbia MO US

Best time to call is right before begins or right after school ends.
Bell Schedule
http://www.columbia.k12.mo.us/hhs/HHS%20Web/Main/0809%20bell%20schedule.pdf
Event Calendar
http://www.columbia.k12.mo.us/hhs/cali/index.php?o=2

Big thanks to NOMADCOWATBK for this one.