If you're replacing your iPhone or Android phone, we've got the perfect idea for your old model: Turn it into a free home security camera with the right app.

These work by using your old smartphone’s built-in cameras ... is installed on two phones — one for using your phone’s camera ...

and meanwhile the revival in film use has given many photographers a fresh excuse to use their old camera the way it was originally intended. We’ll soon see whether it catches on though — the ...