If your new phone keeps you busy enough not to play with your old one, you can display that old smartphone as a fancy nightstand clock. All you need is a simple stand for your phone, whether you buy one like the Moviepeg or you make your own stand. You might even find on eBay some cheap original manufacturers’ docks for your particular smartphone brand, or go crazy with a full-fledged nostalgia dock. Once you’ve found your favorite dock, you just need to pick a clock app of your choice from the dozens of free and paid options in the App Store and Google Play.
Host and Control a Media Server
Put your old smartphone back in the game as your home entertainment hub. With microSD card storage prices going down, you can host your entire music library on your phone and use an app like Twonky for Android to beam music, photos, and videos stored on your phone or computer or from websites to a bunch of DLNA-certified devices, including Samsung and Sony TVs, Microsoft Xbox 360, and the PlayStation 3. You can still use older iPhones to AirPlay content to an Apple TV box via Wi-Fi.
Dedicated Music Player
Retire your car CD changer and bring in your old smartphone. Fill it up with your favorite playlists and stick it in the glove box, so you’ll have constant access to your songs. This works particularly if your car has a USB port, so the phone stays charged and you don’t have to take it out periodically to recharge it. Be wary, though, of the security risks in leaving valuables in the car, even if they are not in sight.