https://techcrunch.com/2019/10/17/samsung-confirms-glaring-s10-fingerprint-reader-flaw-promises-fix/

Galaxy S10 users should be turn on some alternative security features as Samsung works to address a major flaw with the device’s in-screen fingerprint sensor. The consumer electronics giant noted the issue today after a British user reported the ability to unlock her device with unregistered fingerprints.

The flaw was discovered after placing a $3.50 screen protector on the device, confirming earlier reports that adding one could introduce an air gap that interfered with the ultrasonic scanner. The company noted the issue in a statement, telling the press that it was, “aware of the case of S10’s malfunctioning fingerprint recognition and will soon issue a software patch.”