What is the difference between a FAKE china made iphone 5 and a REAL healthy iphone5?

I'm gonna buy a iphone5 from someone who not around my city
he will ship it. So how do i know its a fake or real iphone5?
Tips?

Ask for the serial number so you can trace it back thru 1 800 my apple.

NEVER buy from anyone who is going to ship a phone - you have no way to get your money back if it's fake or stolen. The ONLY safe way to buy an iPhone is in person and meet the person either at the Apple store or a phone store where they have their account so they can get the phone transferred over to your name.
A fake Chinese iPhone will not work with the App Store and will not sync with your computer or any apps. It's basically useless for anything but phone calls. They look just like the real thing - it's not until you try to connect the the app store or sync with your computer that you discover it's fake.
If it's cheaper than a new phone, then it's either fake or stolen. There's no reason why anyone would sell a phone that is maximum 3 months old for cheap if it's not fake or stolen -- because a real seller could get almost the full retail price for it, maybe $50 less

Pretty much everything.

Cheap quality, poor display, no iOS, back comes off, SIM slot is a sticker, etc. Very easy to spot.

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