If you really want to be efficient and don't need to see pictures while you're surfing the Web on your Android smartphone try TextOnly, which is just what it sounds like -- a text-only browser. TextOnly is free to download and will display only the readable text on most of your favorite websites, though if you happen to come across an article that really requires pictures and/or video you can always select the "View the original" option to see the full article in all its glory.

Next: Use Offline Maps, and more.

Accessing maps online (or using apps that do the same thing, as the Google Maps Android app does) sucks up a ton of data. If you travel often, storing maps on your Android device instead of accessing them online will save you money and could even save your life if you get lost in a location where your phone doesn't work (places like remote roads, mountain passes, or even a foreign country).

There are plenty of great offline map apps for Android, including the default Android map app: Google Maps. To download sections of a map for offline use in Google Maps, open up Google Maps and tap the "..." button. Navigate to Settings, Labs, and check Pre-cache map area. You can now download sections of Google Maps (one 10-mile radius at a time) by tapping an area on the map, waiting until an address loads, tapping the arrow, scrolling to the bottom of the screen, and tapping the "Pre-cache map area" option. These downloads take a few minutes, but they're worth it if you know you'll be offline. Make sure to download them over a Wi-Fi connection to minimize your data usage.