Summary
That old Android phone sitting in your drawer with a cracked screen and a battery that barely holds a charge might seem like junk, but it’s not. There are tons of ways to reuse an old Android phone, including turning it into a security camera, dashcam, or a NAS server. If you’re crafty, you can even do all three at once.
The best part is that you don’t need to buy anything extra, and in most cases, you don’t even need to root your device. Just a few free apps, some self-hosted magic, and your old phone will have a new lease on life.
Turning it into a security camera
A 0 phone camera can trigger lights, alerts, or automations just like a 200 commercial camera.
Turning it into a dashcam
A camera, storage, and power you already own
Think about what a dashcam actually is: a camera, some storage, a bit of processing power, and a power source. Your old Android phone already has all of that, plus extras like GPS and mobile data if you need it. What it's been missing is the right software to tie it all together.
[Droid Dashcam is an Android driving video recorder app](https://www.makeuseof.com/old-phone-dedicated-dashcam-free-software/) that's designed to work like a dashboard camera or black box for your car, with continuous loop recording and a lightweight, high‑performance design. It's free to use, and its feature set reads like a checklist of what you actually need in a dashcam app: background recording, automatic start, configurable video quality, and hardcoded subtitles with useful data like timestamps and GPS information directly on the video.
Crucially, Droid Dashcam is built to keep running while you do other things on the phone. It supports recording in the background and offers a floating window with control buttons that sits on top of other apps, so you can keep navigation or music on-screen while the dashcam quietly records in the background. That design solves the biggest annoyance with many camera recorder apps that demand full-screen focus and makes your old phone feel much closer to a dedicated dashcam unit.
Turning it into a NAS
One command between you and your own cloud
If you want cloud storage, Google Drive's measly 15GB is going to run out quickly. Unless you're willing to pay, cloud storage really isn't the all-encompassing storage solution you're hoping it is. But if you've got an old Android phone gathering dust, you can turn it into your own file server. All you need is this simple file server tool that's even giving [Nextcloud a run for its money](https://www.makeuseof.com/nextcloud-didnt-expect-competition-like-this/).
Similar to its PC version, running Copyparty on an Android phone is a matter of running a single command. However, since Android doesn't have a shell ready to go, you're going to have to install Termux first.
[Termux is a terminal emulator that lets you run Linux commands on Android](https://www.makeuseof.com/gave-android-terminal-it-became-most-capable-computer/). You can download it from F-Droid, but avoid the Google Play Store version of the app, as it's no longer actively maintained.
Once Termux is installed, run the following command to install Termux:API and download the Copyparty script. Make sure you give Termux storage access permissions when prompted.
yes | pkg upgrade && termux-setup-storage && yes | pkg install python termux-api && python -m ensurepip && python -m pip install --user -U copyparty && { grep -qE 'PATH=.*.local/bin' ~/.bashrc 2>/dev/null || { echo 'PATH="HOME/.local/bin:PATH"' >> ~/.bashrc && . ~/.bashrc; }; } echo ?
And that’s it. Copyparty is now ready to run on your Android. Just type copyparty anywhere in the terminal, and a server will automatically start. You can also add the —qr flag to get a handy QR code pointing to your file server.
Copyparty
- OS
- Windows, macOS, Linux, Android, iOS
- Developer
- 9001
- Price model
- Free, Open-Source Copyparty can turn almost any device into a file server with resumable uploads/downloads using any web browser. Why this makes sense The parts were already sitting in a drawer The common thread across all three projects is that your old phone already has everything these tasks need: a battery, a network radio, and storage, sitting idle. Rather than buying a 100 dashcam, or a $150 entry-level NAS, you can repurpose hardware that would otherwise sit in a drawer or end up in e-waste. None of these setups need to be perfect or permanent. Still, they’re a genuinely useful way to get more life out of hardware you already own, and that fits squarely into the self-hosted, cost-effective philosophy that makes open-source software so good.