How to Lock Duo Mobile on iPhone With Face ID (iOS 18 Steps)

Time needed

4 taps

Needs iOS 18 or later

Works for Duo Mobile whether or not it has its own passcode. No download needed.

Short answer

Touch and hold Duo Mobile's icon, tap Require Face ID, then confirm. On iOS 18 and later that puts Duo Mobile behind Face ID, Touch ID or your passcode; choose Hide and Require Face ID instead to move it into App Library's Hidden folder as well.

Lock Duo Mobile with Face ID

Find Duo Mobile on your Home Screen or in App Library.
Touch and hold the icon until the quick-actions menu opens.
Tap Require Face ID (or Require Touch ID / Require Passcode, depending on your iPhone).
Tap Require Face ID again to confirm. Duo Mobile now asks for authentication every time it opens.

To test it, close Duo Mobile from the App Switcher and open it again. You should see the Face ID prompt before any content appears.

Hide Duo Mobile in App Library

Touch and hold Duo Mobile's icon and tap Require Face ID.
Choose Hide and Require Face ID instead of Require Face ID.
Confirm. The icon leaves your Home Screen and moves to the Hidden folder at the bottom of App Library.
To open it later, swipe to App Library, tap Hidden and authenticate.

Hiding also locks the app. To undo either, touch and hold the icon again and choose Don't Require Face ID.

Why lock Duo Mobile?

Duo Mobile's privacy label lists location — the kind of data you would not want on screen if someone borrows your unlocked phone. Authenticator apps generate the second factor for your logins. The biggest practical risk is not data collection but losing your codes when you lose your phone.

Business apps often handle other people's data — clients, colleagues and customers — so what they collect can affect more than you.

A lock answers one question — who can open the app on this iPhone. It does not change what Duo Mobile sends to its developer; for that, see Duo Mobile's full privacy report.

What the lock does and does not do

It does

Ask for Face ID, Touch ID or passcode every time Duo Mobile opens
Hide message previews in notifications
Keep Duo Mobile's content out of Spotlight and Siri suggestions
With Hide, remove the icon from the Home Screen

It does not

Stop someone who knows your passcode
Encrypt or change how Duo Mobile stores data
Sync to your iPad or other devices
Remove Duo Mobile from purchase history or Screen Time reports

Don't see Require Face ID?

Update to iOS 18 or later in Settings › General › Software Update.
Make sure a passcode is set in Settings › Face ID & Passcode; the lock needs one.
Some Apple apps (Settings, Calculator, Camera, Maps, Find My, Clock) cannot be locked or hidden.
If your iPhone is managed by work or school, the option may be restricted.

Other settings worth checking for Duo Mobile

Tracking
Settings › Privacy & Security › Tracking. If “Allow Apps to Request to Track” is off, apps cannot ask, and they are told to treat you as having declined. You can also turn it off for this app alone.
Location
Settings › Privacy & Security › Location Services › Duo Mobile. Choose While Using or Never, and switch off Precise Location if a city-level answer is enough.
Notifications
Settings › Notifications › Duo Mobile › Show Previews: When Unlocked keeps message and account details off the Lock Screen.

Duo Mobile's full privacy label

App Privacy label Developer-reported · checked November 1, 2026

Used to track you

0types

None declared

Linked to you

4types

Not linked to you

1type

Identifiers

Is Duo Mobile safe? Every data type explained →

Lock these apps too

After you lock Duo Mobile

Tick what you have done

Checked the label myselfOpen Duo Mobile on the App Store and scroll to App Privacy — labels change with updates.
Reviewed permissionsSettings › Apps › Duo Mobile: switch off anything the features you use don't need.
Declined trackingSettings › Privacy & Security › Tracking, or Ask App Not to Track at the prompt.
Limited locationWhile Using, with Precise Location off unless needed.
Locked the appTouch and hold the icon › Require Face ID (iOS 18+).
Know how to leaveFind the in-app account deletion option before you add personal data.

Tick each step as you do it on your iPhone.

Done. You have applied every control the label points to.

FAQ

Does Duo Mobile have its own passcode?

Some apps offer an in-app PIN or biometric lock in their settings. The App Store privacy label does not say whether Duo Mobile does; the iOS 18 lock works regardless.

What happens to Duo Mobile's notifications when it is locked?

Locked and hidden apps do not show message previews or content in notifications, and their content does not appear in Spotlight search or Siri suggestions.

Can someone who knows my passcode open a locked app?

Yes. If Face ID fails, the lock falls back to your device passcode. Keep the passcode private if the lock matters to you.

Is a locked Duo Mobile encrypted?

The lock controls who can open the app on this iPhone. It does not change how the app stores or syncs data. Encryption depends on the developer and on your device passcode.

Why can't I see the Require Face ID option?

You need iOS 18 or later. Some Apple apps such as Settings, Calculator, Maps and Camera cannot be locked or hidden.

Does hiding Duo Mobile remove it from my purchase history?

No. Hidden apps still appear in App Store purchases and in Settings › Apps, and Screen Time reports still include them.

Is Duo Mobile safe? Full privacy report →Does Duo Mobile track you? →Lock an app: A–Z →All business apps →

Facts on this page come from Apple: lock or hide an app on iPhone, as reported by the developer. Checked November 2026. How we collect data · Report a correction