In fact, this company apparently has kiosks in some malls where you can place the item, punch in some information, and it gives you cash back, on the spot!!! - almost like an ATM for used phones!
Wish I coud be more specific, but..........
Maybe if you google it, you can find the name of the company - try googling "selling used phones", or some similar variation.
Oddly enough most of the kids don't play "telephone" when they use them... they hold them out in front of their faces and yell "Say Cheese!"... I guess a sign of our times.