It's been over 20 years since we began to carry our phone with us everywhere. There's a good chance you've got a drawer old, outdated cell phones. But there may be some use for those phones with these genius uses for them. If your phone has a camera, you can transform them into a simple home security camera. Presence is a free app that turns old smartphones and tablets into Wi-Fi security cameras. Old cell phones or tablets can make a great baby monitor, especially when you're traveling and want to check-in. Try an app like Dormi. Once connected to WiFi, the app will alert your current cell phone if the little guy starts making noise. You can even soothe your babe remotely by talking back to them. Download a simple reading app to your old phone and hand it off to the kiddos. They'll enjoy looking like mommy or daddy while they learn. Set up your old phone as an mp3 player. Then if you're beach or poolside, there are no worries if it gets wet or sandy. Or use it as a radio; you can stream music on your old cell phone via RADIO.com from all across the country.