Field Test mode is back!
14 of 15 from Testing iOS 4.1 (photos)
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By dialing *3001#12345#* on the phone keypad, you can see the signal strength in decibels. It's a negative number so the closer it is to zero, the better the signal.
September 8, 2010 4:22 PM PDT
Photo by: Screenshot by Kent German/CNET
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