He didn't exactly have an answer for that, he just figured if someone heard they might push the button, and the elevator might work if prompted from the outside. So he shrugged a shoulder and lowered his hand instead to fish his new cellphone from his pocket, shifting his bottle to cradle in one arm.
"I do...but I also have no signal," he concluded with a frown, "You have a better idea?" he asked, hand poised to knock again.