I am not sure where you live however the return policy in the US is 14 days from purchase.
- You have 14 calendar days to return an item from the date you received it.
- Only items that have been purchased directly from Apple, either online or at an Apple Retail Store, can be returned to Apple. Apple products purchased through other retailers must be returned in accordance with their respective returns and refunds policy.
- Please ensure that the item you're returning is repackaged with all the cords, adapters and documentation that were included when you received it.
If you are in the US then you would take your iPhone back to the Apple Store and return the iPhone for a refund. After that transaction is completed then you would purchase a new iPhone in a color that you like.
Axel F.