Android Secret: Hidden Android Testing Menu Reveals Detailed Diagnostics

To access the hidden menu, open up the Dialer application and type the following code:

*#*#4636#*#*

Once you press the last *, you’ll automatically be taken to the hidden menu where you can check out the following options:

Phone information


This menu contains a huge amount of information about your phone’s network connections.  The Ping Test is useful if you’re having connection issues, and you can also view your phone’s signal strength.
There are a few extra buttons at the bottom but you should probably leave them alone if you don’t know what they do.

Battery information

 
This menu is pretty simple but gives you a little more information than the standard Android battery menus.  Here you can check out your battery’s health, voltage, and temperature.

Battery history





The battery history menu provides highly detailed information about what has been using your phone’s battery.  The default Battery Usage application only shows information since the last time you unplugged your phone, but this menu allows you to specify viewing since you last booted the phone.

You can view battery use by component, such as CPU, network, GPS, sensor, and partial wake.  When viewing the application list, titles have a percentage bar displaying how much of the battery they actively used.

Usage statistics




Usage statistics shows you how much you (or your phone) used specific applications.  This displays the number of times launched and the total amount of time the application was used.