1. Edit Photos and Video Instagram makes photo editing quick and easy, but if you're a perfectionist with time to kill, choose from a variety of apps that let you modify the smallest aesthetic details of a picture or video. Whether you're sharing on Vine or posting to Facebook -- once you're no longer underground, of course -- your smartphone snaps are sure to stand out. You can also give yourself a photography refresher on the go with Nikon Learn and Explore (Free). Apps for iOS : Photoshop Express (Free), Pixlr-o-matic (Free), Diptic ($0.99), Magisto (Free), Splice (Free) Apps for Android : Photoshop Express (Free), Pixlr-o-matic (Free), Diptic ($0.99), Magisto (Free), Splice ($2.99) Check out Mashable 's recommendations for video editing apps and photo editors for more picks. Image: Flickr, cobalt123 2. Improve Your Vocabulary Use your extra train time to bolster ( verb : to add to, support or uphold) your verbosity ( … [Read more...] about 8 Creative Ways to Use Your Smartphone Underground