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New iPhone has new quite ingenious antenna design - parts of the external steel frame are used as antenna, so there is a good change it will work better than the old iPhone.

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According to the review, the opposite is the case. The demo at WWDC also indicated that the iPhone 4 was worse than the 3GS even for wifi.

I don't think the 3GS was on wifi. Where did you find out this was the case?

They were both on wifi. The problem on the 4 was likely caused by it supporting N, which is of course much better than 3GS's G but is more sensitive to the edge case of ~500 people in the same room as you running wireless base stations without bothering to set up channels properly.

I don't think a change to the antenna would affect how it behaves in the same room as its base station, anyway.

How so?

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