If you have an Android phone, get ready for one of the biggest security updates in recent years. Google has begun rolling out a feature on Android that will restart phones and tablets if they remain locked and inactive for three consecutive days . It may seem like a simple technical change, but it actually has huge implications for protecting your data and how you interact with your device.
This update is part of Google Play Services version 25.14 , meaning you don't need to install a new operating system or buy a new device: any compatible device that receives this update will benefit. If you're someone who leaves their phone in a drawer for days, or if you're worried about losing it or having it stolen, you'll want to know how this mechanism works and why it's become a trend in the cybersecurity world. Let's break down all the details: reasons, how it works, limitations, and consequences for the average user.
What is the Android feature that will reset locked phones?
The new feature Google has rolled out for the Android ecosystem allows phones and tablets to automatically restart if they remain locked (unlocked) for at least 72 consecutive hours . According to the official release notes, this measure is specifically for mobile devices and tablets, so smart TVs, watches, Android computers, and even Android Auto are not affected (for now).
The idea behind this move is as simple as it is effective: to strengthen the protection of data stored on the device in situations of theft, loss, or simply prolonged lack of use. When three full days have passed without interaction or unlocking of the device, the system triggers a restart.
Why does restarting a locked phone increase security?
The main argument from Google, and mobile security experts, is that after a restart, the device enters a so-called 'Before First Unlock' (BFU) state. What does this mean in practice? Very simply: all personal data and sensitive information stored on the phone remains encrypted and completely inaccessible without the owner's key, PIN, password, or biometric authentication.
This state is the most secure an Android phone can reach . Unlike the usual state (when you simply lock the screen), in which encryption keys remain stored in the device's memory and could be vulnerable to specialized forensic attacks, BFU mode makes it impossible to extract almost all private data . Neither brute-force methods, nor advanced hacking tools, nor extraction techniques used by companies like Cellebrite allow easy access to the information if the device hasn't been unlocked after restarting.
By returning to this maximum security state after three consecutive days of inactivity, the window of opportunity for those attempting to illegally access your data is drastically reduced . Physical access to the device is no longer enough: without the original key, your privacy remains protected.
Inspiration and precedents: Is this Google's original idea?
While this represents a significant step forward for Android, this measure isn't exclusive to Google . Apple has been implementing a similar system on its iPhones and iPads for some time. Specifically, starting with iOS 18.1, a feature was introduced that forces a restart of devices after 96 hours of inactivity , with the same goal of returning them to that "zero state" of maximum cryptographic protection.
Even some alternative Android ROMs, like GrapheneOS, have long included user-configurable automatic reboots at set intervals (in their case, every 18 hours by default, though it can be adjusted between 10 minutes and 72 hours). Google, however, has decided to set the period to 3 days and doesn't allow changing it natively , at least for now.
Who is affected by the new feature that will reset locked phones?
Not all Android devices will be affected by this update. Google has limited its reach to smartphones and tablets that are compatible with the latest versions of Google Play Services. Smart TVs, game consoles, car devices, smartwatches (Wear OS), and any other Android devices are completely excluded from this feature.
In addition, some manufacturers and operators may take longer to implement the update, although the great advantage is that it does not depend on a specific version of the Android operating system but on the update of Google Play services.
What happens during an automatic restart? Is data lost?
One of the main concerns for users is whether this type of automatic restart involves data erasure, a factory reset, or the deletion of important files. The answer is a resounding no . The restart does not delete any data, photos, apps, or personal settings. It simply restarts the operating system and returns the device to the state where it prompts for the unlock code or PIN after being turned on.
Furthermore, the data remains encrypted and protected until you enter your authentication method. Until this happens, even biometric systems won't work: the phone won't allow unlocking with a fingerprint or facial recognition after a restart, always requiring the password or PIN. This ensures an additional level of protection against unauthorized access attempts.
Advantages of this measure: protection, privacy and maintenance
The advantages of this reinforcement in automated security are notable:
- Privacy Enhancement: If your phone is stolen, lost, or simply unused for a while, your data will be protected against forensic techniques or opportunistic hackers.
- Terminal maintenance: Restarting your phone periodically cleans up background processes, frees up resources, and can improve performance somewhat over time.
- Avoid exploiting vulnerabilities: Many attacks take advantage of the fact that a phone has been on for days; a restart eliminates temporary processes and data that could serve as an entry point for attackers.
Numerous security reports recommend not leaving devices turned on continuously for weeks or months . This small, automated action contributes to the health and security of most Android phones in use.
Implications for users with multiple devices or secondary phones
There are many situations where a mobile phone might remain locked for several days: work phones, spare devices, phones used as GPS devices, or simply those we keep just in case. If you're someone who has lost their PIN or doesn't remember their unlock code, this change could catch you off guard . After the automatic reset, it will be essential to enter the correct information, and if you forget it, your only option will be to use the SIM card's PUK code or contact your carrier's support.
Therefore, it's crucial to ensure you have your login credentials and unlocking methods readily available if you tend to leave a device unused for several days. Otherwise, you could find yourself locked out and unable to access its contents.
Is automatic restart mandatory? Can I prevent or configure it?
According to currently available information, the feature will be optional . Google itself describes this tool as a "future optional security feature" that can be activated at the user's discretion. Therefore, if you prefer to prevent your phone from restarting automatically after three days of inactivity, you only need to leave the option disabled.
Which devices and versions will receive the feature?
The availability of this feature doesn't depend on the Android version you have installed (Android 12, 13, 14, etc.), but rather on whether your device receives updates from Google Play Services (version 25.14 or higher). This means that coverage will be very broad, encompassing virtually all modern phones and tablets that aren't very old models or from very niche brands.
The rollout is gradual: the feature began arriving in mid-April 2025, but it could take several weeks from launch until it's available on your device . Simply keep your device updated to benefit from this extra security.
What happens if the phone is turned off or runs out of battery?
If the device runs out of battery during those three days or you manually turn it off, the inactivity timer simply resets . In other words, it only counts the time the phone is on and locked, so if it turns off, everything starts again when you restore power or turn it back on.
Thus, it's not a miracle solution for every possible scenario, but it does introduce a much stronger barrier to sophisticated unauthorized access techniques that exploit mobile phones that have been switched on for days.
Limitations and differences with other systems
Google has decided not to apply this feature, for the time being, to devices such as Android TV, Wear OS watches, Android Auto, or the PC gaming platform. The measure focuses exclusively on mobile phones and tablets , prioritizing those devices where particularly sensitive personal data is stored.
While Apple currently offers a 96-hour window before automatic restarts, Google has opted for a 72-hour (three-day) threshold . This difference may be due to a strategy of striking a balance between user security and avoiding inconvenience from unexpected restarts for those who don't use the device much.
Frequently Asked Questions About Auto Restart on Android
- Will I lose my photos or apps? No, everything will remain intact after the automatic restart. You'll just need to enter your initial PIN.
- Is it the same as a factory reset? No, not at all. The phone just turns off and on automatically, without touching the user's data.
- Can I disable the feature if I don't want it? According to official information, it will be an optional feature configurable in the security options.
- When will it be available? It was launched in April 2025, but will be rolled out over the following weeks depending on the model and brand.
Android represents a step forward in security with this decision to automatically restart locked phones . This measure, inherited from iOS and advanced ROMs for privacy-conscious users, drastically reduces the risk of third parties accessing your personal data in case of theft, loss, or prolonged disuse of your device.
While it may require a slight adjustment to the habits of those who leave their phones unused for extended periods, the benefits in terms of data protection and peace of mind far outweigh any drawbacks. Keeping your information encrypted and inaccessible to strangers, even if your phone falls into the wrong hands, is already a reality for millions of Android users worldwide. Share this information so other users can learn about it.