I bought a iphone x silver from freedom mobile a couple days ago (already opened) can I switch colours? (purchased from freedom mobile)?

I bought a iphone x silver from freedom mobile a couple days ago (already opened) can I switch colours? (purchased from freedom mobile)?

Read more: https://iphoneus.org/faq/i-bought-a-iphone-x-silver-from-freedom-mobile-a-couple.html