The old-iPhone baby monitor checklist

The setup itself takes about ten minutes and is covered step by step in how to use an old iPhone as a baby monitor. This page is what you run afterwards, on the afternoon before the first night, when everything looks finished and you have not tested any of it yet.

Nearly every "it stopped working" story comes from one of the items below. All of them are easier to fix at four in the afternoon than at two in the morning.

The pre-flight summary

Before the first night, confirm five things: the nursery phone is plugged into a socket that is genuinely charging it, it will not reboot for an overnight update, the parent phone will still make a noise while a Sleep Focus is on, the nursery has usable signal in the exact corner where the camera sits, and you have watched the feed once in a fully dark room.

The camera device

Confirm it is charging. Cheap cables and dusty ports fail silently. Watch the battery percentage climb for a minute before you accept it.

No case, no soft surface. A phone streaming video runs warm. Take it out of a thick case and keep it off cushions, blankets and folded towels so it can shed heat.

Automatic updates off. Settings, General, Software Update, Automatic Updates. An old phone that decides to install iOS overnight will spend the small hours on a progress bar instead of watching your child.

Old alarms cleared. Spare phones carry the alarms you set on them years ago. Open the Clock app and delete them, along with any calendar alerts that would ring in the nursery.

Do Not Disturb on, or the SIM removed. An incoming call on the camera phone is exactly the interruption you do not want. The baby unit needs no SIM at all, so pulling it is the cleanest fix.

Storage has room and the battery is healthy. A phone below roughly 80 percent battery health still works fine while plugged in, though a swollen battery in a device that runs warm all night is worth replacing rather than repurposing.

It survives a screen lock. Let the display switch off with the app running, then check the parent unit still shows the feed. Test this once so you are not guessing later.

The parent device

Notifications are actually allowed. Settings, Notifications, MonitorUltra. Alerts, sounds and banners on. Denying the permission during setup and forgetting is common.

Your Sleep Focus lets the app through. This is the single most frequent cause of a missed alert. Open your Focus, add the app to the allowed list, and then trigger a real alert while the Focus is running to prove it.

You can hear it from where you sleep. Alert volume, the silent switch, and the distance to the bedside table all matter. Have someone make noise in the nursery while you lie in bed with the phone where it will actually be.

Bluetooth is not stealing the audio. If the phone is paired to a car, a speaker or headphones, alerts can arrive somewhere you are not. Check what happens with your usual devices in range.

The second parent is set up now. Family sharing means several parent devices can watch one baby unit, each with its own alerts. Do that in daylight rather than handing over a phone at 2am. See both parents, one baby monitor for how that works.

The network

Stand where the camera will stand. Signal strength in the middle of the nursery tells you nothing about the far corner behind a wardrobe. Hold the phone in the exact spot and check the connection there.

Test the parent phone off Wi-Fi. Turn Wi-Fi off on it and confirm the stream holds over cellular. That is the path you rely on the moment you step outside, and it is worth knowing it works before you need it. Using a baby monitor over cellular covers what to expect from that connection.

Decide about motion detection. A ceiling fan, a mobile above the cot, or a curtain in a draught will trigger camera-based motion alerts all night. Turn motion off in those rooms and let cry detection do the work.

The night test

Do this one on the evening before, with the room exactly as it will be.

1. Turn the nursery lights off and the blackout blind down.
2. Look at the feed from the parent unit. Check you can see the whole mattress rather than a slice of cot bars. If the framing is wrong, where to put a baby monitor has the placement rules.
3. Make a noise at roughly the volume of a grizzling child, from cot height, and confirm an alert reaches the parent phone with the app closed and the screen locked.
4. Walk to the furthest point you would normally go. Check the feed survives the trip.
5. Leave both devices running for an hour and come back. Confirm the camera phone is still charging and the session is still up.

Anything that fails at this stage is a five-minute fix in daylight.

The list, condensed

Camera phone: charging confirmed, case off, hard surface, automatic updates off, alarms cleared, Do Not Disturb on or SIM out, survives a screen lock, cable at least a metre from the cot.

Parent phone: notifications allowed, Sleep Focus permits the app, audible from bed, Bluetooth checked, second parent added.

Network: signal checked at the camera's exact position, cellular path tested, motion detection decided.

Then the night test, once, before it counts.

Frequently asked questions

Which iPhones can be the camera? Use an undamaged iPhone or iPad running iOS or iPadOS 17 or later, with a working screen, camera and microphone. Check the device and charger before use. A SIM is unnecessary when the device has working Wi-Fi.

Do I need to leave the nursery phone's screen on? No. Leave it plugged in and let the display sleep. Run the screen-lock check above once so you know how your setup behaves.

How much battery does the parent phone use? Much less than the camera. It only receives. The camera device is the one that has to stay plugged in permanently.

What if the connection drops overnight? The devices reconnect on their own once the network returns. The check worth doing in advance is the one in the night test: leave it running for an hour and confirm the session is still live when you come back.