How to Turn an Old iPhone Into a Baby Monitor (Free)

You probably have an old iPhone sitting in a drawer right now. An iPhone 8, XR, or 11 that still works fine but got replaced when you upgraded. That phone is one free download away from being a better baby monitor than most $200 dedicated devices on the market.

This guide walks through exactly how to do it in under five minutes — no special equipment, no subscriptions, no sketchy workarounds. Just two iPhones and an app.

Why an iPhone makes a great baby monitor

Dedicated baby monitors typically ship with a 480p camera, a 2.4 GHz analog radio, and a range of about 50 feet. An iPhone 8 has a 12 megapixel camera, a dual-band radio, and works over your home WiFi or cellular network — which means you can check on your baby from the grocery store, from work, or from anywhere in the world.

Compared to a traditional monitor, you get:

• Much better video quality. A 1080p HDR stream versus a grainy 480p analog feed.
• Virtually unlimited range. Works anywhere you have internet.
• Better audio. iPhone microphones are far more sensitive than the cheap mics in dedicated monitors.
• Smart alerts. Push notifications the moment sound crosses a threshold you set.
• Zero extra hardware. You already own it.

What you need before you start

• One old iPhone (iOS 15 or later — any model from iPhone 8 onward)
• Your current iPhone (or another family member's)
• A charging cable for the old phone
• A stable WiFi connection (or cellular data on both phones)
• A phone stand or mount for the old iPhone

If you don't have a stand, a stack of books works fine. The goal is just to prop the phone up so the camera points at the crib.

Step 1: Factory reset the old iPhone (optional but recommended)

If the old iPhone has years of junk on it, a factory reset clears it out so it can run smoothly. Go to Settings → General → Transfer or Reset iPhone → Erase All Content and Settings. This takes a few minutes.

Don't reset your personal data without backing it up first. If you haven't already pulled photos and contacts off the old phone, do that now.

Step 2: Install BabyMonitor Luna on both devices

Download BabyMonitor Luna from the App Store on both phones. It's free to install, and the core features (audio monitoring, push alerts, two-way talk) work without a subscription.

Sign in with the same email on both devices. This links them to the same family so they can talk to each other securely.

Step 3: Set up the baby device

On the old iPhone (the one that will stay with the baby):

1. Open the app and tap "Baby" when asked which role this device has.
2. Grant microphone and camera permissions.
3. Place the phone somewhere it has a clear view of the crib. Make sure the lens isn't blocked by a case.
4. Plug in the charger. Monitoring uses ~10% battery per hour.
5. Tap the monitoring toggle to start streaming. The screen will stay on so you can verify the feed is working.

Step 4: Set up the parent device

On your current phone:

1. Open the same app.
2. Tap "Parent" when asked.
3. You'll see the baby device in the list — tap the video icon to start watching.

That's it. You now have a live audio and video feed of your baby, and push notifications will fire the moment the baby makes noise above your sensitivity threshold.

Tips for making it work reliably

• Keep both devices plugged in. Especially the baby device — WebRTC video streaming is battery-intensive.
• Turn on Airplane mode + WiFi-only on the baby device if you want to save battery and extend the phone's life. WebRTC works fine over WiFi alone.
• Disable Auto-Lock in Settings → Display & Brightness so the screen doesn't turn off and stop the camera feed.
• Use a tripod or phone stand angled down into the crib. A $10 phone tripod from Amazon works great.

Is it safe to use a phone this way?

The main concerns people have are privacy (is someone intercepting the feed?) and radiation (is the phone too close to the baby?).

Privacy: BabyMonitor Luna uses end-to-end encrypted WebRTC — no audio or video ever touches our servers. The connection is peer-to-peer between your devices.

Radiation: A phone in airplane mode emits zero radio waves, and even with WiFi on, the RF emissions are a tiny fraction of what you get from just holding a phone to your ear. Keep it 3+ feet from the crib and you're fine.

Ready to try it?

Download BabyMonitor Luna on both phones and you can be monitoring within five minutes. The app is free, and premium features (HD video, unlimited family members) come with a 7-day free trial if you want to try them.