My flip phone is boring. It's attached to nothing but the phone number. No email, no money apps, nothing. I can talk to people, I can send and receive basic texts, I can attach photos I take with it's very basic camera to my texts, and it tells me the time. Mostly I use it as a phone.
I have a computer for my email. I use that to pay our monthly bills. Most of those are set up with auto-pay. I read my email about once a fortnight whether I need to or not. I also buy ebooks with that computer but I don't read them on it.
I have another computer that's not associated with an email account or anything else. That's the one I use for general purpose stuff like scanning and editing photographs, writing, etc.. It's got files dating back to the late 'seventies and it emulates all the computers I've used since then. In one or two clicks I can revisit all my BSD stuff, my Atari 8 bit stuff, my MSDOS stuff, etc.
I buy groceries with my ATM card. Sometimes I get cash back. I can go to an ATM machine and get cash. If I'm rummaging around in a thrift store and find a DVD or shirt I like, I pay cash. When I have more sophisticated financial stuff to deal with I go to our credit union.
Reminder to self: Keep it simple, stupid. I'm still that autistic spectrum kid who hates complications. A smart phone would complicate my life.
I still remember the first time I was forced to take a time-out from school. I had a university P.O. box, $600 in my pocket, and the entire world at my doorstep. That's the most freedom I've ever felt.
All this 21st century technology binds me to a world I find somewhat dystopian.