I’m curious about this, what did you do to make it dumb?

I used Apple Configurator on my mac to supervise my iphone. Once that's done, you use configurator to add a profile to the device that (1) contains an allowlist of apps that can be used and (2) an empty allowlist of websites that can be visited. #1 means you can't use any new apps, and #2 prevents the ability to browse the internet by sending links to yourself in e.g. messenger or whatsapp.

This might be how they did it:

https://news.ycombinator.com/item?id=45171200 iPhone dumbphone 10 months ago 399 comments

Interesting. But the list of apps on there is huge! Is it really still a dumbphone? Tha just looks like the apps I already have on my phone, and I still feel like I use my phone too much. What other apps do people have that are so addictive? Games, socials?