I recently bought the Galaxy S3 and wondered what to do with my old android phone. Most of my friends already have better phones and I’d probably only get $15-$20 if I was to sell it.
I figured that since it has wifi and a camera, I could just use it as a wifi network camera.
I installed this free app – https://play.google.com/store/apps/details?id=com.pas.webcam
For this demo video I’ve placed the phone in my driveway. The camera is partially blocked because the phone is just leaning up against something else. You can run the app 24/7 as a security cam. Just be sure that there’s somewhere to plug the charger in.
If you were worried that the phone might be stolen, you could easily hide it, mount it up high or disguise it in something like a plant pot.