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Enable power saving mode when battery is dying
Smartphones and tablets use a lot of power, and on those days you see your battery level plummet you probably scramble to stretch it until you reach a power outlet.
There are lots of articles on the web with tips to cut your phone's battery consumption (See 26 ways to improve your iPhone's battery life) so we won't go into that here. It is easy to forget that Android has a power saving mode that is designed to eke as much time out of the dying battery as possible.
Just turn it on and it will instantly throttle things down to use the least amount of power. This includes turning off haptic feedback, the vibration your phone does when things happen. It throttles the CPU of the device to be gentler on the battery. Lastly, it reduces the frame rate of the screen and lowers the brightness, since the display is the worst offender.
Android data usage warning
Now that mobile broadband in the form of 3G and 4G has spread far and wide, Android device owners need to keep an eye on how fast they sip from the broadband trough. There are a few apps that can keep an eye on 3G/4G data usage, but Android can do that for you.
Under settings somewhere you should find a setting for data usage. This will track the usage on an app level so you can see what is using all your bandwidth.
That's not all, either. If you toggle the setting that alerts you when your data consumption hits a certain level, your phone will warn you. Drag the warning bar to the data usage amount for the notification. No more surprise overages from your big, bad carrier.
Inverted rendering/reverse colors
If you use your Android device at night or in adverse lighting situations, this setting will become your best friend. It reverses colors rendered on the screen, eg black to white. This makes it much easier to read the screen in the dark.
Besides the obvious, displaying black screens has an unexpected benefit. Rendering dark pages uses less power than light pages.