Samsung One UI 9 Forces Lockdown Mode When the Power Menu Closes

Samsung’s One UI 9 has quietly rewired how lockdown mode works on a Galaxy phone. In the beta build, the dedicated Lockdown button is gone from the power menu, and the security feature now arms itself the moment you open the power menu and then dismiss it, locking the handset and disabling fingerprint and face unlock until you punch in a PIN.

That sounds like a small reshuffle. In practice it flips a deliberate, last-resort tool into a reflex that fires every time you reach for Restart, and it takes the choice out of your hands.

What One UI 9 Changed in the Power Menu

For years, holding the power button on a Galaxy phone (or the power-and-volume-up combo, depending on your shortcut settings) surfaced a short menu: power off, restart, emergency call, and a Lockdown toggle. Tapping Lockdown hard-locked the device on demand. First spotted by the outlet SammyFans and corroborated by beta testers posting on Reddit, One UI 9 reorganizes that list.

The Lockdown button is no longer there. In its place sits Medical Info, the emergency card that surfaces a user’s blood type, allergies, and contacts for first responders. The four options a Galaxy owner now sees when the menu appears are short and practical:

• Power Off
• Restart
• Emergency Call
• Medical Info

Lockdown did not vanish with the button. Samsung moved its trigger off the menu entirely. Now the act of opening the power menu and then closing it, by tapping away or hitting back, is what arms the lock. The menu became the switch.

How Lockdown Locks Down a Galaxy Phone

Lockdown is not a Samsung invention. Google built it into Android 9, released in 2018, as a one-tap way to instantly harden a phone. Activating it shuts off fingerprint and face unlock, hides notification content on the lock screen, and switches off Smart Lock options like trusted places and trusted devices.

Once lockdown is on, the only way back in is a PIN, pattern, or password. No biometric shortcut works. The phone treats every face and fingerprint as untrusted until you type the secret you set.

That matters in a specific set of situations. Biometrics can be used against you in ways a memorized code cannot. Someone can hold a phone up to your face or press your thumb to the sensor while you sleep, are unconscious, or are being detained. A PIN lives in your head.

In One UI 9, that hardening now happens without a tap on a labeled button. Open the menu, dismiss it, and the phone is sealed. Google’s design notes on lockscreen and authentication describe the feature as a fast path to a known-good locked state. Samsung’s change makes that path almost impossible to miss.

The Manual Tap Versus the Automatic Trigger

The difference between the old behavior and the beta is small in steps but large in intent. Before, lockdown was something you chose. Now it is something the system does for you whenever the power menu opens and closes.

Here is how the two approaches line up.

Why Automatic Lockdown Cuts Both Ways

The redesign solves a real problem and creates a smaller, more frequent one.

A Harder Shield Against Theft and Coercion

In a high-stress moment, a phone snatch, a forced unlock, a border stop, remembering to dig for a toggle is exactly the thing people fail to do. Automatic activation removes that failure point. A stolen Galaxy whose power menu was touched becomes biometric-proof until the thief knows your code.

It also helps in coercion scenarios. If someone grabs your phone and the menu has already been opened, your face is useless to them. The phone will only respond to something you have to remember and type.

The Convenience Biometrics Users Give Up

The flip side is friction. Plenty of people open the power menu for ordinary reasons: to restart a sluggish phone, to power down before a flight, to reach an emergency screen. Every one of those now ends with biometrics off and a code prompt waiting.

For users who lean on fingerprint or face unlock dozens of times a day, that is a meaningful tax on a routine action. And because the trigger is automatic, there is no obvious way to back out once the menu closes. You committed to a PIN entry the moment you opened it.

Where the Feature Stands in the One UI 9 Beta

This behavior is live in One UI 9 beta 2, the build based on Android 17. It is not a finished, shipping feature, and Samsung has a record of changing course between beta and stable releases based on what testers report.

The state of the rollout, in numbers:

• Android 17 is the base for One UI 9, Samsung’s next major software version.
• Galaxy S26, S26+, and S26 Ultra are the only phones running the beta so far.
• Six countries have access: the US, UK, Germany, South Korea, India, and Poland.
• 2018 is the year Google first shipped lockdown, inside Android 9.

Older flagships like the Galaxy S25 line are expected to join the test in the coming weeks, which is when far more people will run into the new trigger. To take part, eligible owners register through the Samsung Members app; Samsung also documents the rules on its official One UI Beta enrollment portal.

If the auto-trigger survives into the stable One UI 9 release, every Galaxy owner who reaches for Restart will meet a code prompt by default. If Samsung reads the feedback and turns it into an optional toggle, the change ships as the quiet upgrade it was pitched to be.

Frequently Asked Questions

What Is Lockdown Mode on a Samsung Galaxy Phone?

Lockdown mode is an Android security state that instantly hard-locks your phone. It disables fingerprint and face unlock, hides lock-screen notification content, and forces entry with a PIN, pattern, or password. Google added it in Android 9 back in 2018.

How Do You Trigger Lockdown in One UI 9?

In the One UI 9 beta you no longer tap a button. Lockdown arms itself automatically the moment you open the power menu and then dismiss it. The dedicated Lockdown toggle has been removed from the menu, with Medical Info taking its slot.

Does Lockdown Disable Fingerprint and Face Unlock?

Yes. Once lockdown is active, every biometric method is switched off and treated as untrusted. The only way back into the phone is the PIN, pattern, or password you set up.

Which Phones Have the One UI 9 Beta?

For now the beta runs only on the Galaxy S26, S26+, and S26 Ultra, across the US, UK, Germany, South Korea, India, and Poland. Older flagships such as the Galaxy S25 series are expected to follow within weeks.

Can You Keep Using Biometrics After Lockdown Activates?

Not until you unlock with your code. Entering the correct PIN, pattern, or password ends lockdown and re-enables fingerprint and face unlock for normal use afterward.

Will Automatic Lockdown Be in the Stable Release?

It is not confirmed. The behavior currently lives in One UI 9 beta 2, based on Android 17, and Samsung often adjusts features between beta and stable builds, so it could change, become optional, or ship as is.