Every wonder if the signal bars in the upper corner of your iPhone are telling you the truth or not?
Well, there is a secret number that iPhone users can dial to see how much service their phone is really getting. Dialing “ *3001#12345#* ” switches the signal bars to negative numbers, which in turn represents the exact signal rather than just a range — the higher the number, the stronger the signal.
A number between -40 to -70 is equivalent to a 5-bar signal while -102 to -120 is the same as a 1-bar signal.
Check out the video below to see just how easy it is to see your phone’s true signal strength and switch back and forth from bars to numbers.