How accurate is the fingerprint sensor on the Samsung Galaxy S25 Ultra?

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The fingerprint sensor on the Galaxy S25 Ultra is really good. Like, noticeably better than a lot of other phones out there.

Samsung uses Qualcomm's 3D Sonic Gen 2 ultrasonic sensor, which is a mouthful but basically means it reads your fingerprint using sound waves instead of just taking a picture of it. The practical result? It's fast, accurate, and works even when your finger is a little wet or dirty.

Most people who've switched to the S25 Ultra from older Samsung phones say the fingerprint sensor is a clear improvement. The S24 Ultra's sensor could be hit-or-miss for some people, but the S25 Ultra seems more consistent. I've seen plenty of users report 100% success rates with no failed attempts.

One thing people always worry about: screen protectors. Good news here. Most users say the sensor works fine through screen protectors without any tweaks needed. If you do have issues, there's a touch sensitivity setting you can turn on, but many people don't need it.

From a security standpoint, this sensor is as good as it gets on a phone. Your fingerprint data is stored in a secure, isolated part of the chip that's completely separate from Android. The 3D mapping also makes it basically impossible to fool with a fake fingerprint, which optical sensors are more vulnerable to.

The placement is good too. It sits under the screen right where your thumb naturally lands when you pick up the phone. You don't have to hunt for it or adjust your grip.