"Yyyyyeah, I gotta make a call, 'scuse me." There's a phone on the wall in the kitchen, but he's going to go get his cell phone from upstairs, because speed-dial. Also so that it's maybe a little muffled while he does battle with the Fantastic Fone-Tree and maybe chews out the smartest man on the planet for hypnotizing alien invaders into the food supply and not telling anyone about it.