I did this last year and it works well. Want to add a security camera to your home? You can either buy a new one for $150 to $200 or you can use that old cell phone that is gathering dust in your sock drawer. The advantage of using the old cell phone is that it is available either free of charge or for a very low price by adding one app.
I found that the old cell phone no longer works on the cell company’s network but it still works great on my in-home wi-fi network. I simply downloaded a free app that looks for motion in anyplace where I place the phone. I also added a cheap holder for the cell phone that includes a charging cable. I simply plugged the phone into the holder, plugged the cable into a charger and inserted that charger into a nearby power outlet. The cell phone now monitors the room, looking for motion. If motion is detected, it sends a text message to my (new) cell phone that I will receive wherever I am located.
Cheap. Effective. That’s a good combination.
There are several methods of converting your old cell phone into a free or very cheap home security camera. One method is shown in an article by Valentina Palladino in the C|Net web site at http://goo.gl/EyRyZB.