Install the Rabbit Exchange app on the old phone you are trading in and sign in with the Amazon account you ordered from before delivery day, since the check at your door runs through that app.
On phones, laptops, tablets, TVs, fridges, washing machines and ACs that show a 'With Exchange' option on the product page, the exchange takes your old device's value off the new one. The option shows only in select cities, and the value depends on your pincode and on your old device's brand, model and condition. Enter your delivery pincode on the product page to see whether the option shows for you, then add your old device's details to see the value on offer. Subtract any exchange pickup fee and compare what is left with what you could get by selling the device yourself.
The old device is checked at your door when the new one arrives, and it must match the model and condition you entered, so describe cracks, dents and faults honestly when you order. A phone, laptop or tablet that turns on only while plugged into its charger is not accepted.
Skip the exchange on a purchase you might send back. If you return the new product, you get the exchange value back only as a gift card on your Amazon account. Your old device is not returned, and the pickup fee is not refunded.