1. Visit your local Sprint store and turn in an old iPhone 6, iPhone 6s, Samsung Galaxy S7 or Samsung Galaxy S7 edge. 2. Sign up for any of Sprint's rate plans including Unlimited Freedom or 50% off the price of most Verizon, ATT and T-Mobile standard rate plans, with savings until May 31, 2018. 3. Walk out with your new iPhone 7 (32GB) and enjoy the savings! Call Sprint at 1-844-257-3516 to order.