When you upgrade your phone, it’s easy to think that downloading an app like Alfred and taping your old one to the window and calling it home security is a good use of your previous device. But there are a load of issues that this can cause. It can lead to battery swelling as leaving a phone plugged in 24/7 in a sunny window isn’t healthy for the components inside. You don’t have any night vision as without IR LEDs, your phone is blind the moment the lights go out. And of course, latency. Most camera apps have a 2–3 second delay that dedicated PoE or Wi-Fi cameras solved years ago.