sentences:  After entering his phone number and speaking his name, the customer hangs up the phone and a virtual placeholder reserves his spot in the queue.This "virtual queue time" saves inbound telecommunications charges (because the customer is not on the line) and frees up the customer's valuable time.When the placeholder is near the front of the queue, the system calls the customer back, greets him, and puts him at the front of the queue, where he is next to be answered by an agent.