Apple is developing a new security feature for the iPhone that aims to help in situations where the smartphone is snatched from the user's hand while in use. The idea is for the device to automatically lock when it detects a sudden motion typical of a theft, preventing the thief from accessing the unlocked screen.
The iPhone already has several layers of protection, including Find My iPhone, Activation Lock, and Stolen Device Protection. However, these tools are less effective if the thief grabs the phone after the owner has entered the passcode, used Face ID, or is actively using apps. Apple appears determined to close this gap with the new system.
To detect a theft, the iPhone will use sensor data. The phone can identify the sharp movement characteristic of being snatched and then lock itself automatically. A similar principle is already used in Android devices, where the system can react to a sudden jerk and rapid removal of the phone from the owner.
To reduce the risk of false triggers, Apple plans to incorporate additional cues. For instance, the iPhone could check the distance to a paired Apple Watch, the presence of a familiar Wi-Fi network, and the device's location. The system may behave differently if the phone is at home or work compared to an unfamiliar place on the street or public transport.
If the combination of indicators points to a theft, the iPhone will not only lock the screen but also restrict access to sensitive areas of the system. This includes accounts, personal data, and other areas already protected by Stolen Device Protection. This approach should make street thefts less profitable: even if a thief manages to snatch an unlocked phone, using it will be significantly harder.