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Chrome browser bandwidth management
If you don't use the Chrome browser on Android devices, you probably should. It has evolved into a mobile powerhouse for surfing the web.
One of the nicest features in the Chrome browser settings is bandwidth management. Android device owners do a lot of surfing the web, and that can use a lot of data bandwidth.
Enter Chrome for Android to help reduce the data used by the browser. Under settings there is a section labelled "bandwidth management". Here you can restrict the browser from preloading pages unless on Wi-Fi.
Even more powerful is the "reduce data usage" setting. This uses Google's servers to compress web pages, reducing the amound of data served. This can save you quite a bit of data consumption over time.
Enable offline voice recognition
Google has baked some powerful speech recognition technology into Android. This lets you speak search queries, and create content by voice.
This works by checking with Google's servers to make the recognition more accurate. This normally requires your device to be online when entering text by speech.
Fortunately, there's a setting that enables speech input when offline, by downloading language packs to the device. Some implementations of Android turn this on by default, but not all. It's worth a quick check in settings under Language & input to make sure offline recognition is turned on.
Online or offline, Android's recognition can work in multiple languages, so while you're in the settings download and enable dictionaries for any languages you might speak to your device.