I found the truly irreplaceable apps to be:
- Uber
- Banking
- Google Maps
For a camera, I suggest buying a real, standalone camera (I have a fuji x100). The photos it takes are VASTLY better than an iphone. For something smaller that fits in a pocket, people say great things about the Ricoh GR III.
Unfortunately, I found that being out without a smartphone did cause certain anxieties for me: What if I forgot about an appointment? What if I get an urgent email or whatsapp?
The answer would be having an actual assistant (ie, a secretary). Someone I could call to order me an uber or look up a restaurant, and someone who could call me to say "hey, X just sent you a whatsapp message that seems pretty urgent."
I that an AI powered assistant that communicates via phone or text could be a great use for AI and something I hope to code up whenever I have some spare time.