Returning unused and sealed product after 14 days

I’ve bought the iPhone from a physical store, but I suddenly change my mind and wanted to switch into another model. I would like to add the I’ve read from the return policy that customers may return the product within the 14 days from the day it was bought. However, is it possible to return the sealed and unused product that I’ve bought if I would return it beyond the 14 days that are given?