Estimated trade-in values are based on your device’s current market value and are subject to change. It may include additional promotional value based on Google Store promotions.
The estimated trade-in value is based on the info you provide about the model and condition of your trade-in device on the configuration page during the checkout process. The final trade-in value is based on inspection of your old device after it's received. Any differences between the information you provide and your device’s actual condition may change your device’s final trade-in value.
Additional details can be found in the trade-in terms and conditions.