Is your multimedia killing your data? Well, the answer to this question is it depends on how your Apps are configured. Check the settings panel on the Dropbox App, for example. There's a very handy "Use Cellular Data" radio button here. Turn it OFF if you want to avoid your Camera Roll automatically uploading your latest snapshots to Dropbox. Other cloud services have similar settings. Use them and save data. And if you just have to watch that funny Youtube video or play the latest track from Iggy Azalea, then turn the quality settings way down. Remember, a 320Kbps music track equals 2.4MB of data per minute.