Turn That Old Phone in Your Drawer Into a Security Camera

You already own a camera you’re not using

Open your junk drawer. There’s probably a phone in there, maybe two, from the last time you upgraded. Cracked screen, dead battery, outdated and forgotten. That old phone has a camera that still works fine, a processor more powerful than computers from a few years back, and Wi-Fi built in.

In other words, you own a security camera already. You just have to wake it up. This is a fun weekend project that ends with something actually useful, which is my favorite kind.

Why bother when cameras are cheap?

Fair question. You can buy a camera for 30 bucks. But here’s what that cheap camera comes with: a cloud account, a monthly fee if you want to save footage, and a company in another country storing video of your home or office on servers you’ll never see. Some of those budget cameras have been caught with gaping security holes, which means the thing watching your front door might also be a door into your network.

Repurposing an old phone keeps the whole thing in your control. No subscription. No stranger’s cloud. And you’re recycling hardware you already paid for instead of buying more plastic. For a homelab tinkerer, that’s the good stuff.

What you’ll need

An old smartphone (Android or iPhone, both work)
A charger and a spot near an outlet, because the phone needs to stay plugged in
Your home or office Wi-Fi
A free camera app, and maybe a cheap phone stand or a bit of mounting putty

That’s the whole shopping list, and most of it you’ve got lying around.

The setup, step by step

Step one: wipe it first. Before anything else, factory reset the old phone. It’s full of your old photos, logins, and messages, and you don’t want that baggage on a device that’s about to sit watching a room. A clean reset gives you a fresh start and closes the door on your old data.

Step two: pick a camera app. There are free apps built exactly for this. Look at Alfred Camera or a self-hosted option like a simple RTSP app if you’re more technical. The app turns the phone into the camera and gives you a way to view the feed from another device.

Step three: install and point it. Put the app on the old phone, set it to camera mode, and set up a viewer on your current phone or computer. Prop the old phone where you want eyes: the front door, the register, the stockroom, the spot where packages get left.

Step four: keep it plugged in. A camera that dies overnight isn’t a camera, it’s a paperweight. Leave it on the charger full time. These old batteries aren’t healthy anymore, so treat it like a device that lives on power.

Step five: lock it down. Give the app a strong, unique password. Turn on two-factor if the app offers it. A camera you can watch from anywhere is a camera a stranger could watch too if you leave it wide open.

Make it smarter without spending more

Once the basics work, a few free touches turn this into something genuinely handy:

Motion alerts. Most of these apps will ping your phone only when something moves. No staring at a dead feed. You get a nudge when it matters.
Night vision or low-light mode. Newer phones handle dim rooms surprisingly well. Test it in the dark before you rely on it.
A second phone, a second angle. Got two old phones? Now you’ve got two cameras covering two spots, still for free.

One honest limitation

I won’t oversell this. An old phone is a great way to watch a specific spot (the back door, the cash drawer, the server closet) and to learn how this stuff works. It’s not a replacement for a wired, professional camera system covering a whole storefront with months of recorded footage. The battery is old, the mount is improvised, and a phone can crash where a dedicated camera just runs.

So treat it for what it is: a free, private, in-your-control set of eyes on one important spot, and a fun first step into doing your own tech instead of renting it from a subscription. If it proves the value and you decide you want real coverage for the business, now you know what you actually need before you spend money.

The weekend challenge

Dig out the old phone. Reset it, install a camera app, point it at the thing you keep wishing you could keep an eye on. Give it a strong password and leave it charging. An hour of your Saturday, zero dollars, and you’ve turned e-waste into a working tool.

This is the heart of the homelab mindset: look at what you already own, and ask what else it can do. The old phone was going to sit in that drawer forever. Now it’s working for you.

If you want to go further, build out real camera coverage for your business the right way (local recording, no sketchy cloud, no backdoor into your network), that’s a project we love. But start with the phone. It’s the cheapest way to find out if you even like watching your own front door.