Smartphones are undeniably smart—and they’re only getting smarter. With every new generation, advancements push their capabilities even further.
As a result, people have become more reliant on their devices. Smartphones have become digital companions, storing everything from everyday moments to deeply personal information. Naturally, much of that data is sensitive, and this growing dependency raises important concerns about privacy and security.
This is why Google is introducing a new security feature to its Android operating system that automatically reboots a phone if it's been locked and unused for three consecutive days.
The update was quietly rolled out via Google Play services, a core component of Android that powers many system-level functions.
Under the Security & Privacy section, the update notes that Android "will automatically restart your device if locked for 3 consecutive days."
While Google hasn’t publicly commented on the reasoning, the moves ties into Android’s security states:
- Before First Unlock (BFU): When a device is powered on but not yet unlocked, its sensitive data remains fully encrypted.
- After First Unlock (AFU): Once the device is unlocked, certain data becomes more accessible—making it more vulnerable to brute-force attacks or forensic tools.
In this BFU state, anyone willing to gain access to the phone must physically enter a code to enter. Until they do so, many of the phone's functions, including wired and wireless data access, are all disabled.
And here, by automatically rebooting after prolonged inactivity, Android phones can automatically reverts to BFU state, re-securing encrypted data and making unauthorized access significantly more difficult.
This is the main reason why forensic tools used by law enforcement or malicious actors rely on access during AFU state.
In short, the update, which comes with Play Services 25.14, is a subtle yet significant step toward reinforcing user privacy—especially in a world where locked phones are often targets of forced data extraction.
Apple rolled out a similar feature with iOS 17 in 2023.
On iPhones, this automatic reboot after prolonged inactivity was introduced as part of its continuous push for on-device privacy and security. Just like on Android, the intention is to keep devices in a BFU state longer, minimizing the window of vulnerability that follows when a phone is unlocked.
In both ecosystems, the goal is the same: to prevent unauthorized access to personal data during idle periods.
And with users increasingly storing sensitive and intimate details on their devices, protecting that data when the device is out of reach—or out of use—is critical.
It’s a game of digital cat and mouse between phone makers and forensic tools. And in this round, both Android and iOS just made the cat work a lot harder.
Read: Automatically Switching 'AFU' To 'BFU' Allows Apple To Enhance iOS Security With 'Inactivity Reboot'