Home Security Camera - Alfred allows you to continue using your old smartphone or tablet by turning them into a security camera.

You can set this up easily by applying the application to any number of spare devices you will also need to have it on your current device so it can act as the control center. One nice thing with set up is that the satellite devices being used for surveillance, etc., are that no SIM card needs to be present which if the phone is a spare you may have reused the SIM card in your current device.

Home Security Camera - Alfred isn't just for surveillance though, you can also communicate between devices, and even set it up for motion detection. There is even night vision included as well as the ability to remotely activate a device's flashlight. Additionally, if your phone has front and back cameras both can be utilized with Home Security Camera - Alfred. So, if you are looking to set up an inexpensive security camera system then this could prove a real money saver - since you already have all those "extra" phones sitting around being used as paperweights.