Replace Your iPhone Signal Strength Bars With Numbers

You can replace the Signal Strenght Bars with Numbers easily :-

Steps:-

1. Tap the keyboard tab then dial *3001#12345#*
2. Press and hold the Power button until the power slider appears.
3. Press and hold the Home button until the Field Test program is terminated. Notice the signal strength numbers still remain.

USE THE SAME METHOD GET BACK TO BARS AGAIN.

Source :- http://www.iclarified.com/14999/how-to-replace-your-iphone-signal-strength-bars-with-numbers