Google's Android 16 QPR2 update brings back a handy feature for Pixel users: Screen-off Fingerprint Unlock. This feature, which allows users to unlock their Pixel devices with a fingerprint even when the screen is off, was initially introduced in the Android 16 DP2 update for the Pixel 9 series. However, it mysteriously disappeared in later beta versions, leaving users confused. Now, it's back with the stable QPR2 update, but not for all Pixel models. The feature is available on Pixel 9 and newer devices, including the Pixel 10 Pro XL, but older models like the Pixel 8 Pro are missing it. This discrepancy may be due to hardware differences between the ultrasonic fingerprint scanners in newer models and the optical scanners in older devices. Ultrasonic scanners can detect fingerprints more accurately and consistently through the display, even when the screen is off, by transmitting an electronic pulse. In contrast, optical sensors may struggle when the display is off because they rely on light from the screen to read fingerprints. Users can enable Screen-off Fingerprint Unlock by going to Settings > Security & privacy > Device unlock > Fingerprint. This update is a welcome addition for those who prefer a more convenient unlocking method, especially those who find the Always-on Display feature too power-intensive. However, it's important to note that this feature may not be available on all older Pixel models due to hardware limitations.
