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Apple said it was “stunned” to discover the formula it used to calculate how many bars of signal strength to display is totally wrong. What does this mean?

April 26, 2017Apple bars CALCULATE discover Formula said signal strength Used

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Apple said it was “stunned” to discover the formula it used to calculate how many bars of signal strength to display is totally wrong. What does this mean?

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While one might assume that each bar represented on the iPhone signal strength icon represents the same number of decibels, apparently that’s not the case. According to testing by the Web site AnandTech, the fifth bar on the iPhone represents about 40dB, but the fourth bar only represents about 10dB. The third bar represents a change of only about 2dB. The second bar represents 4dB, and the first bar represents a difference of 6dB.