Turn an old Android phone into a screen-off security camera (no cloud, LAN-only)

#android #tutorial #security #selfhosted

Old Android phones pile up in drawers. Instead of letting one die there, you can point it at a doorway, a driveway, or a pet's favorite corner and let it record. Here is a straightforward, cloud-free way to do it, and the reasoning behind each choice.

Why an old phone is a good camera

A three-year-old phone still has a decent sensor, Wi-Fi, and a battery. The two things that usually get in the way are the screen (it drains power and announces that the phone is recording) and cloud services (a monthly fee plus your footage on someone else's server). Solve those two and an old handset becomes a capable local camera.

The core trick: recording with the screen off

The feature that makes this practical is screen-off recording. The camera keeps capturing while the display is fully dark, so the phone sips power instead of gulping it and does not glow in a dark room. On Android you get this either through a background-camera recorder app or, on some OEM camera apps, a "screen off" toggle buried in settings.

Setup in about a minute

Mount the old phone where you want coverage. A cheap gooseneck clamp or even a stack of books works.
Keep it on a charger. Continuous recording will outrun any battery, so treat it as a wired device.
Install a background-camera app that supports screen-off capture and, ideally, live viewing from a second device over your local network.
Start recording, turn the screen off, and confirm from your main phone or laptop that the stream or the saved clips are coming through.

Local network vs cloud

If you only need to review footage later, saving clips to the phone's own storage is enough. If you want to watch a live feed, look for an app that streams over your LAN so the video never leaves your home network. That keeps latency low and keeps a subscription out of the picture. The trade-off is range: LAN-only means you watch from the same network, not from anywhere in the world, unless you add your own VPN.

How the common options compare

Option	Local-only viewing	Cost	Notes
Alfred Camera (free tier)	No, cloud-based	Free tier limited to 2 cameras; paid ~$35.99/yr	Cloud relay, easy setup
AtHome Camera	Partial	Free with paid tiers	720p on free tier
IP Webcam	Yes, LAN	Free	Local streaming, more manual setup
WardenCam	Yes	Free/paid	Effectively unmaintained since mid-2023
Background Camera RemoteStream	Yes, LAN live view	Free	Phone-as-camera, screen-off recording, live remote view on your own network

Figures reflect what these apps advertised as of mid-2026; check each store listing before you rely on a number.

What to watch out for

Heat is the real enemy of a phone that records all day on a charger. Give it airflow and avoid sealed enclosures in direct sun. Also confirm your recorder actually keeps running when the screen sleeps; some phones aggressively kill background apps, so you may need to exclude the app from battery optimization.

Try it

The app I build for this is Background Camera RemoteStream. It does screen-off recording and live viewing over your local network, with no cloud account and no per-camera fee.