I just upgraded to 4.1 this afternoon and decided to do the Field test. At home were I have barely 3 bars I got between -102 and -94, without moving an inch. I did the death grip on the phone and it went to -111 then came back to -109.
Now I believe that this is measuring in decibels and if I remember my Navy Radar Antenna electronics correctly for every 3 DB rise your power doubles. Is this correct on cell phones also?
This would mean that my signal doubled from -111 to -109.