“Apple has re-introduced field test mode in iOS 4.1, which will allow you to quickly check the quality of your cellular signal by simply dialing: *3001#12345#* and pressing Call on your iPhone,” David W. Martin reports for Cult of Mac.
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“The signal bars on your iPhone will be replaced by a number,” Martin reports. “The higher the numeric portion of the negative number gets the worse your signal is. For example, -100 is worse than -79.”
Martin reports, “If you tap on the displayed number the display toggles between displaying the number and the normal signal bars.”
Read more in the full article here.
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