The Samsungand both have an ultrasonic fingerprint sensor hidden under the display. The new technology means you will not find a sensor on the back or side of the phone, as is the case with the Galaxy S10E Capacitive Fingerprint Reader.
But because the technology is new This is the first time we've seen it on a smartphone, and it's certainly going to be a couple of issues.
If you're struggling with the S1
Use in the real world
If you add a fingerprint to your device, hold the phone the way you do it most often and place your finger on the screen at the same angle and at the same angle as you would most likely do on a daily basis.
In other words, do not lay the phone flat on a table and lift your finger on the sensor straight up and down. Unless you unlock your phone most often.
Some have been more successful in putting their finger over the sensor and leaving the sensor in place until the phone prompts you to remove your finger from the sensor.
This increases the time it takes to register a fingerprint. An extra time for the sensor to read and assign your fingerprint can make a difference.
Do not get carried away
The Setup interface instructs you to move your finger between scans. This is accurate, but do not move your finger drastically. Instead, move your finger slightly between the scans.
If you can not get the reader to work with a particular fingerprint, open Settings > Biometrics and Security> Fingerprints and remove that particular fingerprint and register then again.
Updating your mobile software
On the day of the launch, Samsung released an update to the Galaxy S10 series, and one of the improvements is improving the performance of the fingerprint sensor.
To improve fingerprint sensor performance, make sure your phone is running the latest software. Open the Settings app and select Software Update > Download & Install and follow the instructions when an update is found.