How did you get the iPhone?
If you purchased it online, be aware that you need to return it through the online store within 10 days and then they will give you a new one.
You won't get a new one from an Apple Store if you purchased online because they can't undo the online transaction and then put through a new one for you. The Apple Retail store and Apple Online store are two different entities, so they can't exchange the other one's transactions/purchases.
Just wanted to make you aware of this.
If purchased in store, return in store and they will be able to exchange it for another new one. They may or may not have backup storage of your specific model. Just see how it goes.