This is a part of my setup
USB cable, phone, memo book ruler.
My default phone is Nokia 105. No internet. No camera. No distractions.
I make calls (2G only), receive texts, use an alarm clock, keep (emergency) contacts and offline calendar. It's always on, one battery charge lasts for two weeks.
Disclaimer: I still use Maps, Mail, Twitter, and Telegram on my old iPhones, when I travel, for example.