Every time you evaluate your device to know the exchange price of your Smartphone, a new Quote ID is generated & assigned to your Smartphone. This Quote ID contains the evaluation summary of your Smartphone (basis the inputs given by you) and the exchange price of your Smartphone basis the evaluation summary. Each Quote ID is valid for 7 days only. After which you must use Re-quote option to generate new exchange price. The exchange price of used Smartphone drops as it gets older hence you may get lower exchange price when you re-quote. Hence it is advised that as soon as you generate exchange price you exchange your Smartphone either through Samsung Retail Stores or Samsung Online Store.