How to get scratches off iPhone 4S?

How do you get scratches off iPhone 4S?

Only God knows.

On screen or back?

Either way, I'm pretty sure it's not possible.

Don't buy an iPhone.
You really can't because you are literally digging into metal, I would just be careful, possibly use a case, if they are on the screen replace it (super expensive though), or if you have a super warranty just break it and get a new one from your carrier. My dad broke his HTC Thunderbolt, but paid with his plan to get a all damages warranty, so if you have that break it and use the warranty. He did get a new Thunderbolt (I think it was through best buy).