The verdict: a more accurate signal display, but no change on the underlying antenna issue
The folks at Anandtech who did the original analysis of the iPhone signal attenuation problem have tested the latest iPhone software updates, both iOS 4.1 beta and the official version iOS 4.0.1 that Apple (AAPL) released on Thursday.
Their verdict: Apple, for what it’s worth, did what it promised it would do — it made the bars more accurate.
The chart at right shows the changes in height and dBM ranges of the iPhone’s signal bars. But the total effect can be seen more clearly in the two charts posted below the fold. One compares the dBM mapping of iOS 4.0 with beta iOS 4.1, the second compares Apple’s two versions with Android’s bar mapping scheme.
Note: Klug and Shrimpi wrote a separate review of the software update for CNNMoney. You can read it here.
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[Follow Philip Elmer-DeWitt on Twitter @philiped]