How to know if the iPhone 5 is fake?

I'm about to purchase an iPhone 5 white. It costs 15, 000 philippine pesos (340 us dollars) and it's 2nd hand.

I saw the pictures, but the pictures arent of the phone turned on, and the back of the phone does not have the iPhone lettering?

Is this a fake?

Thank you

Added (1). The phone looks legit, but I just don't see an iPhone lettering on the back

Added (2). Http://www.sulit.com.ph/index.php/view+classifieds/id/21893748/Iphone+5+16G+White?referralKeywords=iphone+5&event=Search+Ranking, Position, 1-10, 10#advertisementDetails

Here is the link to the pictures. Please tell me if this is original or not.

Take it to any phone store before buying it. Tell the seller you want a phone store to verify it's legit before you buy it. If they won't agree then you know it's a Chinese fake that's not even worth $30 as it won't connect to the internet or sync with the App Store

Check the phone perfectly before buying…

Without the pictures it is impossible to say.