We all love getting new gadgets, but what to do with the old ones? Here are 20 clever ways to put your old Android phone or tablet to good use. Got extra smartphones sitting around your office? How about tablets? As we move multiple generations into mobile technology, more and more of us are building up collections of old, dated devices from both our work and our personal lives. And more often than not, those devices do little more than take up space and gather dust. Here's a little secret, though: Your abandoned Android gadgets are actually virtual gold mines. You just have to find the right way to tap into their potential and give them new life. So grab the nearest DustBuster and get ready: Here are 20 ways to make your old phone or tablet useful again. 1. Use it as a wireless trackpad and controller for your computer With the right software and a couple minutes of configuration, your old Android device can act as an on-demand controller for your Windows, Mac, or Linux comp