Got my iPhone 3g 6 weeks before the 2.1 release and was very frustrated with network issues. Things got much better with 2.1, and then continued to improve over the next few weeks as (I believe) AT&T upgraded their network. Now it's all good. So I think the initial 3g launch had problems in both Apple's firmware and AT&T's network. Apple fixed their end of it, and AT&T continues to make improvements.
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