If you're using a iOS device, take a look at Apple Configurator. I blocked Safari and a few other time-sink apps with it and noticed a extreme reduction in habitual phone usage. It's mainly a texting/messaging device with a few critical apps (Mint, Messenger, RBC, Notes) installed. It's a happy medium between a full on feature phone.

As far as calm goes, I started writing again instead of consuming HN all day.

https://itunes.apple.com/us/app/apple-configurator-2/id10371...