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it says so on the iphone info page

Fingerprint-resistant oleophobic coating on front and back

iphone-4-first-hands-2010-06-0712-07-19-rm-eng.jpg
 
The iPhone 4 uses a new screen coating that converts your finger oils into a screen cleaning agent.

It's magical and revolutionary.
 
The coating is useless in the long run if there's no way to reapply it.

Don't get me wrong, I love the coating but it really doesn't last more than a couple of months (and you are stuck with the phone for up to 2 years). I wish they sold something like a spray so we can reapply it periodically or a screen protector that had it as well.
 
The coating is on the front and back and it doesn't repel fingerprints, it helps resist them and makes them easier to remove.
 
The coating on my 3G proved to be no more of a hassle then fingerprints.

Over time and usage, I'd get a haze which I'd need to wipe off. Without the coating, I'd fingerprints and so I'd need to wipe it off.

What I did notice is that the coating would rub off over time and some areas. I'm no fan of the coating.
 
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