About 2.5 years ago I struggled a bit with smartphone addiction. All the screen time limitation apps didn't work out for me and I decided the smartphone had to go. Instead I bought the then newly released Nokia 8110 4G, which is a so-called featurephone. This phone really worked out well for me.

It had great battery life of up to a week, WiFi, 4G and supported Whatsapp. You could take an occasional snapshot with it's 2MP camera and if you really wanted to, browse the internet on a tiny 2.45" screen. Also you could connect it with you Google account to sync contacts and email.

With these features it allowed me to do the beneficial things you use an internet connected phone for, like staying in touch with my peers and looking for directions. But I was no longer able to mindlessly scroll the internet for hours each day because it was just not possible.

So if you're also not happy with your smartphone usage, I can really recommend you to give a featurephone a try. At ~60€ it is cheap enough to try it for 2 weeks and put it in some drawer if it doesn't work out.

Disclaimer: 1,5 years later I started using a smartphone again because I had a kid and wanted to be able to take better pictures.

[0]: https://www.nokia.com/phones/en_int/nokia-8110-4g/specs