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iOS 4.1 restores limited Field Test mode
Most likely this is showing the signal level in dBm which is the decibel representation of the signal power relative to a 1mW reference level. i.e.1mW = 0dBm. Negative values indicate levels less than 1mW, positive values indicate levels greater than 1mW. A 10dBm difference means a factor of 10 difference in signal level. For example +30dBm = 1000mW = 1W. Likewise -30dBm = 0.001mW = 1μW. |
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