How To Access The iPhone Field Test App

Apple has hidden a field test app in iOS, which will allow you to quickly check the quality of your cellular signal by simply dialing a special code on your iPhone. For all those who wish to launch the hidden Field Test App to check out their cellular signal quality, wait no further.

Punch in this code - *3001#12345#* followed by pressing Call on your iPhone, which will launch the field test app. The signal bars on your iPhone will be replaced by a number. The number will be a negative number, and the higher the negative number, the worse your signal is. For example, -100 is worse than -50.  If you tap on the displayed number, the display toggles between the number and the normal signal bars.

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There are other sections of the Field Test App that display additional technical information, but the main feature is the signal test. To quit the app, simply press the Home button.

Source: href="http://www.cultofmac.com/128306/access-the-hidden-field-test-app-for-iphone-ios-tips">Cult of Mac