iPhone Signal Strength using decibals

This does not require any downloads, no apps, no jailbroken iPhone required. Just follow the steps below and you will have a whole new way of checking out your signals.

Step 1: Type in *3001#12345#* on your iPhoneâs keypad and press call.

Step 2: You have now entered field test mode, just tap on the signal indicator on the top left of the screen and you will be able to toggle between signal bars and decibel numbers. (Remember the closer you are to Zero the better the signal).

Step 3: Hold down the power button until you see the âslide to power off barâ, however do not power off your device.

Step 4: Keep pressing the home button until the screen closes and return to your homescreen.

Thatâs all there is to it! Even when you restart your iPhone you will still be able to toggle between bars and numbers!

To take your iPhone back to its default mode, you just have to type in *3001#12345#* on the keypad and press call. After that press your home button once and your default settings will come back and you will not be able to toggle between bars and numbers any more, the standard bar will re appear.