Samsung is rolling out a new “Inactivity Restart” setting to more Galaxy phones, allowing devices to automatically reboot themselves if they’ve been locked and untouched for 72 hours, a quiet security upgrade aimed at protecting data on lost, stolen or long‑abandoned handsets. The feature, which builds on similar capabilities recently added to core Android and iOS, pushes a phone back into a hardened state where sensitive information stays hidden until the owner enters their PIN or password again.
What the new 72‑hour reboot actually does
Reports from Android‑focused outlets and Samsung watchers say Inactivity Restart is appearing under Settings → Security and privacy → More security settings on recent Galaxy models after February and March updates.
– The toggle’s description is straightforward: “Restart your phone if it remains locked for 72 hours.” Once enabled:
- The phone starts a 72‑hour countdown each time you lock the screen; any successful unlock resets the timer.
- If the device stays locked and unused for the full three days, it automatically reboots.
- After that reboot, the phone is in Android’s “Before First Unlock” (BFU) state, a higher‑security mode where only device‑encrypted data is accessible.
In this state, Samsung and Android sites note that:
- Notifications from some apps, caller names and details, and certain alarms are hidden until the user unlocks with a PIN, password, or pattern (biometrics may be disabled until after first unlock).
- If the SIM is protected by a PIN, you may need to enter that as well before receiving calls.
Crucially, Inactivity Restart is optional, it ships as a toggle, not a mandate, so users who don’t like the idea of an automatic reboot can turn it off.
Why Samsung is doing this now
Samsung isn’t inventing the concept from scratch; it is aligning Galaxy’s behavior with a broader platform trend.
- A Google Play services update introduced an Android‑wide safeguard that can automatically reboot phones and tablets after 72 hours of inactivity, returning them to the BFU state and disabling biometrics until a passcode is entered.
- Apple added a similar three‑day inactivity reboot option in iOS 18.1, which reboots iPhones after extended periods without unlocks to harden data at rest.
Gadgets360 and others say Samsung’s Inactivity Restart “builds on this idea” inside One UI, giving Galaxy users a clear, branded control over when and how that 72‑hour protection kicks in.
The security rationale is simple:
- If a phone is lost or stolen and someone manages to keep it powered on but locked, there is a window where lock‑screen notifications, caller IDs and some app content can still leak sensitive information.
- By forcing a reboot after 72 idle hours, the device reverts to a more secure state where that data is encrypted and hidden until the rightful owner successfully unlocks it again.
AndroidCentral frames the change as Samsung “furthering its protections for devices left unattended for whatever reason,” calling it a “safety net” for phones that sit idle on a desk, in a drawer or in someone else’s hands.
Which Galaxy phones get Inactivity Restart?
Coverage from SamMobile, Android Central and other trackers suggests that Inactivity Restart is arriving first on newer flagships, with signs of a broader rollout:
- SamMobile reports that the feature is now present on the Galaxy S26 series, with the toggle live on at least some S26 units after the February patch.
- AndroidCentral says fans have also spotted Inactivity Restart on Galaxy S25 models and the Galaxy Z Fold 7, again via recent One UI updates.
- Gadgets360 notes that it appears to be tied to One UI 8.5 on supported devices and cites Samsung‑focused blog SammyFans as the first to flag it on non‑S26 phones.
NewsBytes, however, points out that while select S25s and the Fold 7 already show the option, “no S26 support yet” was visible at the time of its report, an example of how staggered rollouts can create brief confusion across regions and SKUs.
A Samsung community post on Google’s underlying auto‑reboot function adds that the feature is part of Google Play services 25.14, meaning more Galaxy phones should gain the capability over time as OEM and Google updates converge.
How it differs from Samsung’s old “auto restart” setting
Samsung has long offered a scheduled auto restart option on Galaxy phones, marketed mainly as a way to keep devices running smoothly by rebooting at set times.
Inactivity Restart is different in several ways:
- It is conditional, not scheduled: it only triggers after the phone has remained locked for 72 continuous hours, not at a fixed clock time.
- Its primary goal is security, not performance. As FindArticles notes, Inactivity Restart is “security‑led,” deliberately pushing the device into Direct Boot/BFU so that sensitive data stays encrypted until the next unlock.
- It is tightly integrated with Android’s pre‑unlock security model, mirroring Google’s and Apple’s newer protections for devices that have not been recently authenticated.
In other words, this is best understood as part of a modern mobile‑security stack, alongside features like full‑disk encryption, Find My, and lock‑screen privacy controls.
Privacy benefits, and trade‑offs for everyday users
Security experts and tech reviewers see clear upsides, especially in edge cases:
- If you misplace your phone on a trip and it stays powered but unused, a 72‑hour reboot reduces how much a casual finder can learn from your lock screen.
- For high‑risk users, journalists, activists, executives, this extra step makes “rubber‑hose” or forensic attempts slightly harder, because the device drops back into its maximum‑protection state if untouched.
There are, however, some user‑experience trade‑offs:
- After the automatic reboot, some alarms, call details and app notifications may not fire or display fully until you unlock, which could be confusing if you weren’t expecting it.
- People who intentionally leave a secondary phone locked for long stretches, for example, a travel SIM device, a kid’s spare or a work handset in a drawer, might find the surprise reboot inconvenient.
Samsung’s decision to keep the feature opt‑in addresses some of that friction: power users can switch it on for stronger security, while others can stick with the status quo.
What it signals about the direction of phone security
The 72‑hour reboot option is part of a broader shift in mobile security design:
- Platforms are acknowledging that device theft and quiet access to lock screens remain real risks, even with strong passwords and biometrics.
- Google and Apple are both moving toward time‑based protections that assume a long‑unused phone should default to maximum protection, not convenience.
- OEMs like Samsung are adding their own UX layer, clear toggles, explanatory text, integrations with privacy dashboards, to make these low‑level safeguards more visible and controllable.
For Galaxy users, Inactivity Restart won’t change day‑to‑day behavior as dramatically as a new camera or AI feature. But in the background, it tightens the gap between when a phone leaves your hand and when your data becomes significantly harder for anyone else to see.
In an era of increasingly sophisticated threats, and increasingly sensitive lives stored on a single device, that kind of quiet, 72‑hour line in the sand may prove to be one of the more consequential updates Samsung ships this year.