Turning an old Android phone into a security camera sounds simple until you actually try to leave it running. The screen stays lit and burns battery, the recorder stops the moment the display sleeps, and half the "IP camera" apps want a cloud account before they'll show you a single frame. Here's the approach that has held up for me, plus the tradeoffs worth knowing before you commit a spare phone to the job.
Why the screen is the real problem
Most casual "just record video" setups fail for the same reason: Android aggressively pauses foreground camera work when the screen turns off, and keeping the screen on 24/7 cooks the battery and the panel. What you actually want is a recorder that holds a foreground service and a partial wake lock so capture continues with the display fully off. That single detail — capture surviving screen-off — is what separates a usable stakeout phone from a paperweight that dies in four hours.
A setup that survives being left alone
The configuration I keep coming back to:
- An old phone on a charger, screen off, mounted where it can see the room or doorway.
- A recorder that keeps running with the display off and writes footage to local storage rather than a vendor's cloud.
- A way to check the live view remotely over the network when you're not home, without exposing the raw stream to a third party.
Local-first storage matters for two reasons. Latency and reliability aside, footage that never leaves the device isn't sitting on someone else's server subject to their retention policy or their next data-breach headline. Local-only recording used to be a selling point; in 2026 it's table stakes.
The tradeoffs nobody mentions
Heat is the quiet killer. A phone pinned at 100% charge for days runs hot, and heat ages the battery fast — prop it somewhere ventilated and, if the app allows, cap charging or run it plugged with the battery managed. Storage fills faster than people expect, so pick a resolution that matches the job (a hallway doesn't need 4K) and rely on motion-triggered capture instead of recording dead air. And Wi-Fi coverage at the mounting spot decides whether remote viewing actually works, so test the live view from the far end of the network before you trust it.
What I use
I built and run Background Camera RemoteStream precisely to cover the screen-off capture + local storage + remote live-view combination above. It's free, and it's aimed at exactly this "old phone, mounted, left running" use case rather than trying to sell you a subscription.
If you've solved the screen-off capture problem a different way — a Termux script, an RTSP server, a self-hosted setup — I'd genuinely like to hear it in the comments. There's more than one right answer here.
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