Our teen could hold her iPhone under the dinner table and 2-thumb touch-type texts while keeping eye contact with us, hoping we wouldn't notice. When caught, sh

Our teen could hold her iPhone under the dinner table and 2-thumb touch-type texts while keeping eye contact with us, hoping we wouldn't notice. When caught, she demoed that she could be almost 100% accurate even with the phone completely out of her sight. Dead-reckoning with no feedback! Necessity is the mother of invention, I suppose.