By selling your old cell phone! When you sell an iPhone you no longer use, you can get the cash you need to upgrade to the iPhone 12! Here’s how to sell your iPhone the smart way with Decluttr: Tell us the capacity and condition of your phone to get an instant price. No auctions, no fees, no hassle! Then, place your phone into a box and ship it using one of our FREE send options. With our Fast Next Day Payments, you’ll get paid the day after it arrives by Direct Deposit or PayPal!