The shift found in iOS 11 beta 1 is a minor change from a presentation standpoint, and it isn’t clear at this time why Apple made the shift back to the bars. However, as part of the shift, Apple appears to have altered the algorithm for representing signal strength to the user somewhat.
Testing the signal strength display
The signal that the iPhone measures when in Field Test mode is measured in decibel-milliwatts (dBm). The unit is a combined one, and is a unit of electrical power in decibels (dB), referenced to 1 milliwatt (mW).
One full milliwatt of power delivered is 0 dBm. The closer the delivered power is to 0 dBm, the stronger the signal thus the negative, logarithmic scale on the unit.
Utilizing a walking path that has been previously been used for LTE strength measurement, AppleInsidercarried along a pair of iPhone 7 Plus phones, an iPhone SE, and a plastic stool. One iPhone 7 Plus is on iOS 11 and the other two phones are on iOS 10.
Källa: Inside iOS 11: With ’antennagate’ a distant memory, Apple switches back to signal bars
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