+1...I also remember reading an article (last year) about the whole ATT network performance issue. The gist of it was that non-Apple phones like the BlackBerry, etc. performed much better and used network resources much more efficiently and in-line with ATT's network. There were supposedly things that the iPhone did that were not the most network-friendly (I don't remember the technical details, but it wasn't just the heavy network loads that iPhone users impose). So, when ATT boasts about having the fastest 3G network, it IS true, but they are not using iPhones for these tests--they are using other phones like BlackBerry, etc.
There are people who believe that the iPhone has inefficient radios, particularly for voice, which may be the reason why iPhones notoriously drop calls. If this is the case, it'll be interesting to see if the new external antennas help with this going forward in the iPhone 4.
(That said, I have also heard that the dropping calls issue is peculiar to the US market, again pointing fingers at AT&T's network rather than just the iPhone.)
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