I understand where you're going with this now. Employees tap out responses on their smartphones. Put yourself in the shoes of a customer now: you walk in and see an employee looking down at their phone and tapping away. Most people won't assume that they're conversing with a customer. The phone conversation doesn't have the same "hey, I'm busy with another customer right now" effect that an audible phone or in-person conversation has. Customers will assume the worst: that they're being ignored for the sake of some employee's personal texting.