I've done this recently. It's only been six weeks so not sure if I'll keep it up, but I have felt very little pain. I put my sim back in my iPhone the other day when I needed an Uber to go to the vet after reading that recently taxis in my city have been denying people with pets even if you tell them you have one when ordering. Sim went right back in my flip phone when I got home and I actually experienced some relief as I did it.

Enjoy your portable physical SIM while you can, they are absolutely coming for it