How do you set a numeric value?
From CNET:
1. Open the Phone app and from the keypad dial
*3001#12345#* and then tap the
Callbutton.
2. Once in Field Test mode, you will see a negative number instead of the five dots in the upper-left corner. The closer to zero, the stronger your signal. As a rule of thumb, according to
CNET's own Marguerite Reardon, "around -113 decibels is on the low end of the signal bar range, and around -50 decibels is on the high end." If you press the Home button to exit Field Test mode normally, the dots will return. We want to keep the numbers around, so instead of hitting the Home button, hold down the
power button until the
Slide to power off message appears.
3. Release the power button and from the power off screen, hold down the
Home button for roughly five seconds until you exit Field Test mode. The signal strength numbers will remain and you can toggle between the numbers and the dots by tapping on them.
To reverse course and get rid of the signal strength numbers, go back into Field Test mode as you did in step 1 above and then simply hit the Home button to exit Field Test mode. When you return to your home screen, the familiar five dots will greet you.