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Judging by physical differences...

iPhone 2g - rounded edges, black bottom part on back of it

iPhone 3G - rounded edges, thinner than 2g and all one color on back

iPhone 3GS - like 3g except has chrome engraving instead of white on back

iPhone 4 - boxy appearance, if AT&T version, has an antenna on top and two on the sides instead of 4 on the sides

iPhone 4S - always has two antennae on each side and has Siri!

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Wiki User

6y ago
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Wiki User

11y ago

They say on the back what generation in is

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Q: How do you tell iphones apart?
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