The Dormi app is an ingenious application for your smartphone or tablet and will give your older devices a new life as a baby monitor.
Designed to work on Andoid devices, the Dormi app works by tethering your main phone and any extra phones you have lying around together. Simply place your old phone–with the Dormi application installed–in your baby's room, and use your main phone to listen in the room, push to talk, and even find out if your baby is awake.
More likely than not–unless you're one of the few people who recycle their phone when they get a new one–you probably have one or two smartphones somewhere in your drawer collecting dust. If you're in the market for a new baby monitor, the Dormi app can save you a lot of money.