The Galaxy S24 marks a new step for Samsung on a frequently discussed point: the under-screen fingerprint sensor. Previous generations left a mixed impression, with correct speed and sometimes annoying failures. This time, the goal is clear: to offer more stable, faster recognition that is less dependent on external conditions.
In practice, the evolution is real. Unlocking generally takes less than half a second. This speed gives an immediate feeling of fluidity, especially during repeated unlocks throughout the day. The animation is shorter, and detection is more direct.
But not everything is perfectly consistent. On some slightly off-center presses, the system may require a second attempt. This behavior remains occasional, but it reminds us that placement precision still plays a role.
Real conditions often challenge the sensors. Slightly wet fingers, greasy screens, dust… these are common situations that reveal the weaknesses of a biometric system.
With the Galaxy S24, ultrasonic technology shows its advantages. Unlike optical sensors, it does not depend on light. Result: better tolerance to slight moisture.
However, not everything is perfect. A heavily soiled screen can disrupt reading. In this case, the failure rate increases, even if it remains occasional. This behavior is logical, as ultrasonic waves must pass through the surface to analyze the finger.
In some extreme situations, performance slightly decreases. For example, with very dry or damaged fingers, recognition may require several attempts.
Tests show that in these conditions, the success rate can drop to around 85 to 90%, which remains acceptable but less impressive. This highlights the importance of precise fingerprint registration from the start.
Beyond comfort, the question of security remains central. The Galaxy S24 uses an ultrasonic sensor capable of mapping the finger in depth. This approach adds an extra layer of protection against reproduction attempts.
The probabilities of false recognition remain extremely low, often estimated at 1 in 50,000. This level is sufficient to secure access to the smartphone, but also to validate sensitive actions such as payments or access to banking applications.
Another important point: biometric data is stored in a space isolated from the rest of the system. This greatly reduces the risk of unauthorized access, even in the event of a software intrusion attempt.
In practice, the sensor works perfectly with mobile payment services. Validation is fast and does not require repetition.
This stability is essential, as it conditions the trust placed in the smartphone for financial transactions. On this point, the S24 reaches a solid level, comparable to the best current solutions.
An often overlooked element can disrupt the experience: screen protection. Tempered glass or plastic film, not all accessories react the same way with the sensor.
On the Galaxy S24, compatibility improves but remains dependent on the quality of the product used. Glass that is too thick can slow detection or cause repeated failures.
In some cases, the user must re-register their fingerprints after installing a protection. This simple adjustment allows for good precision to be regained.
Thin films specially designed for ultrasonic sensors give the best results. They allow for a speed close to that of a bare screen.
Conversely, some standard glasses can greatly degrade recognition. This point may seem secondary, but it directly influences the daily experience.