Engadget
Don't get rid of your old phone, turn it into a security camera

AlfredCamera transforms an old iOS or Android phone into a live security camera in under five minutes by pairing it with a main device via the same account or QR code. The free plan provides motion-triggered video, siren, low-light mode, and two-way talk; paid tiers add up to four cameras, HD streaming, longer recording loops, and cloud storage. The device must remain plugged in, have battery optimization disabled for the app, and be mounted on a stand or in a waterproof case for stable, weather-resistant use.