Apple could be planning to bring back Touch ID using an in-display fingerprint sensor, but not until 2021. 

This comes from a report from Ming-Chi Kuo, a well-respected analyst that has a decent track record when it comes to predicting how the Cupertino-based tech giant is going to act. 9to5Mac is reporting that the analyst is predicting the technology will be included along with Apple’s FaceID facial recognition tech for the 2021 iPhone launch as a single security solution.
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