One of the nicest things about having a smartphone or a tablet, for that matter, is that you can keep adding apps with little or no cost. For a gadget lover like myself, this equates to having countless gadgets at my disposal. The Android apps store is rich hunting ground for anyone who cares to look. Here are a few guitar apps (all free) that I have installed on my phone.
Of course, who doesn't need a chord finder every now and then? Basic Chords has only slightly over a 1,000 downloads but I like it for its simplicity. It shows you all the different variations of the same chord, as well as plays the chord when you touch it. You can also choose other instruments like ukulele, mandolin, etc.