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The speed will be a lot faster on 4g
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The difference is one is bigger than one but i will not tell you what is bigger just check every thing.
The iPhone 4 has video calling, 5Megapixel camera (iPhone 3 has 3MP) Flash, front camera, HD video recording, LED light, 2 hours more talk time, 1 hour extra internet use.
I am sure there is a lot more...oh yeah the iPhone 4 also comes in white =)
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