If "Back to The Future" were a thing today, what would be the contrast?

And two other tangential threads about time traveling to the 80s with a modern cellphone:

https://boards.straightdope.com/t/could-the-1980s-reverse-engineer-a-modern-iphone/775816

https://boards.straightdope.com/t/who-could-a-time-traveler-pawn-his-cell-phone-off-too/427879