Hello! Apologies if this has been asked before... But through the Apple/Brightstar trade-in program, is it possible to trade in two (or more) iPhones at the same time, for credit toward a single new iPhone? Or is the program just one-for-one? (Also, would it make any difference in this case if the phones are turned in at an Apple Store, or mailed in through the Brightstar partnership?) As a result of a carrier switch and a 5S hand-me-down, my wife and I ended up with three spare iPhone 4Ss. $50/each would take a big chunk out of the price of a new iPhone SE.