Its like saying Disneyland is the most walkable city in the US.
It’s true though.
Productive: Maps, check the stock market, read non fiction/Wikipedia, pay bills, translate voice or text written in a foreign language, use as a bike computer or GPS tracker, hail a ride/taxi, rent a bike, communicate with people.
Fun: Read books/comics, amateur photography/videography, puzzles.
Purposefully left out apps that cause doomscrolling and addiction.
I’ll give you a BIFL answer that’s not super heavy on performance. I’ll assume your primary goal is commuting or some light exercise.