The “WILL CALL” option is when you chooses to call when a delivery of propane is needed. It is suggested that if a customer chooses this option they contact our office before the tank reaches 20% giving us plenty of time to schedule the delivery on the regular route day. Do NOT let the tank run empty! If a delivery is needed before the regular route day, remember you do not receive your route day discount and may incur additional charges for priority service or leak test.