10-26-2010, 08:08 AM
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Join Date: Sep 2010
How much better is it than its predecessor? A lot better. It’s much thinner (though slightly heavier), lasts longer on a charge (thanks to Apple’s A4 chip), and will offer two-way FaceTime video chat. You also get HD video recording and an all-new three-axis gyroscope that should make gameplay even more immersive.
Sadly, there's no rotation lock button as on the iPad.
Rest of the differences are here blog.laptopmag.com/iphone-4-vs-iphone-3gs-worth-the-upgrade#axzz13RwKNmnK