The implied current direction for the future is that all the functions of your phone will be migrated directly into your brain. The “screen” will be projected into your vision and options chosen by thoughts.
All vision, sound, thoughts and feelings could be recorded. You could download and replay any recording from your experiences, or indeed from any experience of anyone else. Communication by mindscapes would replace the spoken and written word.
Invented experiences could be created for you to replay or interact with.
Your perception of reality could be changed and selected thought patterns switched off.
Pleasure and pain sensations could be activated on demand.
Your thoughts could interact with an artificial intelligence that calculates the most efficient algorithm for any process you wish to undertake. You could instantly download data and skills; and have immensely augmented cognitive processing speeds.
Your mind could operate any physical body, humanoid or not. As only the brain would need to be maintained, you would potentially have ultra long life.
Of course a totalitarian regime could easily control their population by these means; and an empowered sadist would run amok in all the enslaved minds. Philosophically it makes me wonder what it is to be a human being, but in the realm of practicalities it makes me certain: humans must become worthy of the knowledge we are gaining.