Are you ready for a new, better, thinner, faster iPhone? Apple is expecting its rumored September release to inspire millions to give up their older versions. On Friday, the company officially launched its in-store program to trade in a used iPhone for credit toward the purchase of a new one. Customers can bring in their used devices to get a price quote. (An iPhone 4 or 5 will seemingly bring in between $80 and $253.) The phone will be wiped if the customer agrees to the bid, or returned to them if not.