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Anyone with a Samsung Galaxy S1
As reported earlier this week in The Sun, a British couple discovered that when using a screen protector on their Galaxy S10 smartphone, the fingerprint scanner would accept any print from only the owner's print.
A woman heard that she could use her left thumb print to unlock her device, even though she had once registered the print of her right thumb. And then it appeared that her husband could open the phone with one of his thumbs.
In this situation, the phone was paired with a particular gel screen protector that was purchased on eBay for £ 2.70. It is unclear whether the problem applies to all types of screen protectors, but Samsung has warned anyone using their Galaxy handset with a screen protector to turn off the fingerprint scanner and switch to another device unlock option, at least until a solution is released.  The Galaxy S10 has unique hardware for scanning fingers. It uses ultrasound to map the 3D edges of a fingerprint and it has been previously reported that some screen protectors are not compatible with this scanner because they have created a small air gap that obstructed scanning. Fortunately, Samsung says it will solve the problem with an upcoming software patch.
What is also unclear is whether other Samsung models have been affected, such as the Galaxy Note 10, which also has an ultrasonic fingerprint scanner. To turn off your fingerprint reader: Go to the app Settings > Lock screen > Screen lock type and then enter your unlock code to access the option that lets you disable the fingerprints unlock setting.
Source: BBC via The Sun