In case you didn’t know, it is possible to see the signal strength indicator in numbers instead of signal bars on any iPhone (except the original iPhone) without jailbreaking it and it’s reversible.  It has been one of the old hidden features that works on the iPhone running iOS 4.1 or later.

It’s a lot more useful to see the signal strength indicator as a number [in decibels(dBm)] rather than as a signal bar (after we explain how to read the number a little bit later).


The trick is to enter the Field Test mode on the iPhone and use the trick to force quit an app to exit it.

Here’s how to change the signal strength indicator with a number rather than a signal bar:

    Launch the Phone app
    Dial *3001#12345#*
    Then tap on the Call button, which will launch the Field Test app (or enter the field test mode). You’ll also notice that the signal strength indicator has switched to a number from the traditional signal bar.
    Now hold the Power button until the red slider (slide to power off button) appears.
    Release the Power button and press the Home button until the Field Test app quits

That’s it. You’ll notice that the signal strength indicator continues to be displayed as a number. You can now tap on the indicator to toggle between the signal strength bar and number. You can revert the changes by restarting your iPhone entering the field test mode again and exiting the app as you do normally.





Source: iphonehacks

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