How to Lend Your iPhone Without Anyone Snooping

Turn on Guided Access in Settings under Accessibility, then triple-click the side button while you’re in the app you want to share. The iPhone locks to that one app until you authenticate. It takes about a minute to set up and it stops the most common problem, which is someone wandering out of the app you handed them.

The short version

Lending a phone is awkward because the request is almost always innocent. Someone wants to make a call, look up an address, or see the photo you just mentioned. The uncomfortable part is that handing over an unlocked iPhone hands over everything on it, and there’s no polite way to hover.

Guided Access solves the specific problem of drift. It pins the device to one app, so the person can use what you gave them and nothing else. No swiping into Photos, no glance at a notification, no accidental tap into Messages.

It’s an accessibility feature rather than a security feature, which matters for understanding its limits. But for the everyday situation of passing your phone across a table, it’s the right tool and almost nobody has it turned on.

Set it up once

You only do this part once. The setup lives in Accessibility because the feature was built for a different purpose, which is why most people have never found it.

1. Open Settings and tap Accessibility.
2. Scroll down to Guided Access, under the General section, and turn it on.
3. Tap Passcode Settings, then Set Guided Access Passcode, and choose a code.
4. While you’re there, turn on Face ID or Touch ID if you’d rather end sessions with a glance than a code.

Choose a Guided Access passcode that isn’t your device passcode. If you use the same one and hand the phone to someone who watched you type it, you’ve handed over both locks at once.

One quirk worth knowing: if you have several accessibility shortcuts enabled, triple-clicking the side button opens a menu of options instead of starting Guided Access directly. You can fix that in Accessibility under Accessibility Shortcut by leaving only Guided Access selected.

Lock the phone to one app before you hand it over

Now the part you’ll actually use. It takes about three seconds once you’ve done it twice.

1. Open the app you want the person to use. Camera, Maps, Phone, whatever it is.
2. Triple-click the side button. On older iPhones with a Home button, triple-click that instead.
3. Tap Start in the top right.

The phone is now locked to that app. To end it, triple-click again, authenticate, and tap End.

Before you tap Start, the Options button in the bottom left is worth a look. You can switch off the volume buttons, disable the keyboard, turn off motion response, and set a time limit that ends the session automatically. The time limit is genuinely useful when you’re lending the phone to a child rather than an adult, because it ends the session without you having to ask for the phone back.

You can also circle any part of the screen with your finger before starting, and that region stops responding to touch. This matters more than it sounds, because Guided Access keeps someone inside an app without caring what that app can reach.

The camera is the clearest example. Hand someone Camera to take a photo of you and they’re one tap away from your entire library, since the thumbnail in the corner opens straight into Photos. Guided Access counts that as the same app and won’t stop it. Circle the thumbnail before you tap Start and the shortcut goes dead.

A few worth closing off, depending on what you’re lending:

• Camera: the library thumbnail in the bottom corner.
• Maps: the search field, which holds your recent searches and saved places.
• Phone: the tabs along the bottom, if you only want them dialing and not reading your recents or contacts.
• Safari: the address bar and the tabs button, both of which expose history and whatever else you had open.
• Photos: the share button, if you’ve deliberately given someone the library to browse.

Spending five seconds circling one control is the difference between lending an app and lending a doorway.

The single-photo trick

This is the one most people don’t know, and it solves the situation that actually causes trouble: showing someone a photo.

If you open Photos and hand the phone over, Guided Access keeps them inside Photos, which does nothing for you. Photos is the app you were worried about. But there’s a version that works properly.

1. Open the exact photo you want to show, full screen.
2. Triple-click the side button.
3. Tap Options and turn Touch off.
4. Tap Start, then hand the phone over.

The screen stays frozen on that one image. Taps and swipes do nothing, so there’s no way to move to the next photo, open the share sheet, or back out to the library. When they’re done, triple-click, authenticate, and end the session.

It feels slightly theatrical the first time. It’s also the only method on iOS that genuinely limits someone to a single image, and it takes less time than explaining why you’d rather not scroll.

What Guided Access does not do

An honest guide has to include this part, because the feature is often described as though it were a lock on your data. It isn’t. It’s a restriction on what the screen responds to while a session is running.

Situation	Does Guided Access help?
Someone borrows your phone and drifts into other apps	Yes, this is exactly what it’s for
Someone swipes through your camera roll while you watch	Yes, with Touch disabled on a single photo
A child wandering out of a game into your email	Yes, and the time limit helps too
Someone force-restarts the phone to escape	Ends the session, but they hit the lock screen
Someone who knows your device passcode	No, they can unlock it later at leisure
Your phone is lost or stolen	No, this isn’t an anti-theft feature
Photos being readable on an unlocked phone	No, nothing is hidden or encrypted
Someone with physical access and time	No, treat it as a deterrent

That restart row is the one people ask about. Holding the hardware buttons will power the device down whatever mode it’s in, and that ends Guided Access. The consolation is that a restarted iPhone comes back to a locked screen and demands your passcode, so the person ends up with less access than before, not more.

Two settings worth changing before you lend anything

Guided Access handles the app. These two handle the things that leak around it.

• Notification previews. If a message arrives while someone is holding your phone, the banner may show the sender and the content. Go to Settings, then Notifications, then Show Previews, and set it to When Unlocked or Never. Never is the safer choice if you regularly hand your phone to people.
• A lock on the Photos app itself. iOS lets you require Face ID to open Photos, which covers the case where you forget to start a Guided Access session at all. It’s a good default rather than a strong protection, and we go through the setup and its limits in how to lock the Photos app on iPhone.

While you’re tidying, it’s worth knowing that the Hidden album is not a privacy feature in any meaningful sense. It’s two taps from the main view and it appears in the sidebar by default. We explain why in the iOS Hidden album isn’t private.

When Guided Access is the wrong tool

There’s a category of sharing this doesn’t touch, and it’s worth naming clearly, because reaching for the wrong tool is how people end up surprised.

Guided Access protects you when someone is using your phone for their own purpose. It does nothing when the sharing itself is the point: you’re showing holiday photos, passing the phone around a dinner table, or letting someone scroll through the album from last weekend. In those moments you want them in Photos, moving freely, and a restriction that stops them defeats the purpose.

It also does nothing about the ordinary shape of a shared household. A partner, a family member, or a flatmate who knows your passcode isn’t going to be stopped by a UI restriction on one session. Neither is the phone you leave unlocked on a desk.

For both cases the mechanism has to be different. Instead of restricting what the screen does, the sensitive photos have to not be in the library at all, so that browsing freely simply doesn’t reach them.

Where Arca fits

Arca handles the gap Guided Access can’t cover. Photos you move into it are encrypted individually with AES-256-GCM, and the key is derived from your PIN using Argon2id, a deliberately slow key-derivation function that makes guessing that PIN expensive rather than instant. Everything stays in the app’s own container on your device, with no server and no account, so there’s no cloud copy and nothing on our side to breach. For moments where you might be pressured to unlock, there’s a decoy vault. The full model is on our security page.

The practical effect is that handing someone your unlocked phone stops being a decision. They can open Photos, scroll as far as they like, and the vaulted photos aren’t there to find.

Being straight about the limits, as always: a vault protects what you actually move into it, not what’s still in the camera roll. It protects photos at rest, not while the vault is open in front of someone. And because Arca keeps nothing on a server, it can’t recover your photos if you forget your PIN, so keep your own backup of anything irreplaceable.

Use Guided Access for the borrowed phone. Use a vault for the photos you’d rather never be one swipe away.

Get Arca on the App Store to keep your private photos encrypted with AES-256-GCM on your device, with no server in the loop.