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Everyone with a Samsung Galaxy S10: If you use the biometric fingerprint to unlock your phone, you have no security until Samsung releases an update for to address a problem that lets anyone unlock your device with your thumb.
As reported in The Sun earlier this week, a British couple discovered that the fingerprint scanner accepts all prints instead of using a screen protector on its Galaxy S10 smartphone by only the owner's print.
A woman was told that she could use her left thumbprint to unlock her device, even though she had only ever recorded the printout from her right thumb. And then it was found that her husband could open the phone using one of his thumbs.
In this situation, the phone was paired with a certain gel screen protection purchased on eBay for £ 2.70. It's unclear if the issue covers all types of screen protectors, but Samsung has warned anyone using its Galaxy phone with a screen protector to disable the fingerprint scanner and switch to another device to unlock the device, at least until a fix is released.  The Galaxy S10 has unique hardware for scanning fingers. It uses ultrasound to map the 3D ridges of a fingerprint and it has been previously reported that some screen protectors are incompatible with this scanner because they created a small air gap that prevented scanning. Fortunately, Samsung says it will solve the problem of an upcoming software patch.
What is also unclear is whether any other Samsung models are affected, such as the Galaxy Note 10, which also has an ultrasonic fingerprint scanner. To turn off the fingerprint reader: Go to the app Settings > Lock Screen > Screen Lock Type then enter your unlock code for access to the option that will let you turn off [19459Fingerprints unlock setting.
Source: BBC via The Sun