iPhone Duo User Shares 1-Finger Touch ID Trick for Faster Unlocking

Q: Could a simple shift in how you scan your finger make the iPhone Duo unlock instantly?

Yes—some iPhone Duo owners say a small change in fingerprint enrollment can make unlocking feel almost instant, though it is not guaranteed for everyone. The tip is to register the lower part of the index finger, or add the same finger again from a different angle, instead of relying only on the fingertip pad. Because Touch ID on iPhone Duo sits in the side button, that lower finger area may naturally land on the sensor as you pick the phone up. Users on Reddit and MacRumors reported that this creates a smoother “lift and unlock” motion. The idea fits Apple’s broader guidance. Apple allows multiple fingerprints and additional angles in Settings > Touch ID & Passcode, and more usable fingerprint surface can improve recognition reliability. That can also help with Apple Pay and app sign-ins, not just unlocking. There is an important limit: iPhone Duo’s unlock experience may still include a brief pause at the Lock Screen. Reviews have noted that Apple appears to separate fingerprint recognition from fully entering the Home Screen, so better enrollment can improve recognition timing but may not remove that software delay entirely. To get the fastest result, users can try adding the lower index-finger area as an extra print and make sure “Rest Finger to Open” is enabled in Settings > Touch ID & Passcode or Settings > Accessibility > Side Button. If the method matches how you naturally hold the phone, it can make unlocking feel much quicker.

3 articles · Updated · MacRumors · Oct 24

A Reddit user said iPhone Duo owners can speed up unlocking by registering the lowest part of the index finger, not the fingertip pad, for Touch ID.
That section of the finger reportedly lands more naturally on the side button during pickup, letting the phone unlock as it is lifted; the poster called it "arguably better than Face ID."
MacRumors forum users echoed the tip, with at least 1 other Duo owner saying it worked for them.
Grip style still varies, so results may differ, but users can test the approach by adding extra finger positions in Settings > Touch ID & Passcode.