The company has tested in-screen Touch ID and even contemplated putting it on the power button.
One possibility Gurman suggests is that Apple could move Touch ID to the power button on lower-end iPhones, such as the iPhone SE?While this would be similar to the bifurcation of Face ID and Touch ID on the iPad, Gurman says he hasn’t “heard anything about that actually being in the pipeline?
As I’ve noted in the past, there’s also a security benefit to having both Face ID and Touch ID on the iPhone.For instance, you could require both a Face ID authentication and a Touch ID authentication to access ultra-sensitive information.