How far into the future are we talking? I think the most likely scenario is that eventually phones will be connected to our brains via implants, but before that people will be wearing contacts with heads up displays and/or earpieces.

You'll be able to control your phone via voice or via gestures (the contacts will come equipped with a built in camera or we'll see something like soli in the pixel phones where the gestures are read via something similar to radar), but eventually they'll be telepathically controlled (this will either require an implant or the user to wear a headband [possibly a smaller circular monitor that afixes to the head with adhesive] of some sorts, so it probably won't catch on for a lot of people until implants are more common).

Consumer phones won't need hardware features like thermal imaging or night vision, so they'll just gradually shrink until the main computing device fits on your wrist like a pip boy. They may or may not have an actual display (I'm sure the earlier models will look a lot like smart watches).

Then there's the Black Mirror corneal transplant. Those might make more sense than a brain transplant for a lot of people (do we want to open our brains directly to the internet?).