How iPhone differs from iPhone 3G in looks

how to know which model is of iPhone and which of iPhone 3G by just seeing its outlook features. In my iPhone 16 GB is wriiten in its back side. But in package box iPhone is written instead of iPHONE 3G. Please tell me its 3G model or just a simple old model of iPhone.

The Original iPhone has a metal back. The 3G has a shiny black or white back.
http://www.apple.com/iphone/gallery/#image7
You may have a Chinese knockoff rather than a real iPhone if you did not buy it from an authorized seller.

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    Far too much uneccesary information in your post, which only confuses things, a vast amount!
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  • APPLE Id differs from mac to iphone ... i did not do this.

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