I have a Nokia 8110 phone with KaiOS installed. It works fine as a phone, lasts 4 days per charging, but keypad input is still a pain. The best use of such phone would be with AI assistant. For example, you pick up the phone, press a button and speak, then the screen shows the information or it sends out a message, etc. In another word, it could be a portable smart speakers with screen, minimizing keypad input.