I don't perspire.
As a result of his accident, Doug couldn't perspire from his shouldersdownward, and Brian had to spray him with water to ward off heat exhaustion.
When you place the phone on your skin to make a call, your skin is not only in direct contact with the bacteria, but it also starts to perspire and even trap oil in the pores.
You really perspire in these sessions, which is meant to help train your body to sweat more efficiently, lowering your body temperature while you exercise.