What I've done and has worked for me:

1. Take the book, leave the phone and laptop at home. Go to a coffee shop, park, bar (a chill kind of bar, not a sports bar or a dive bar) and read. <-- no longer works well for me, I don't live in a downtown so it's not as convenient.

2. Declare a space in the home to be tech-free. <-- Works ok for me in the winter time here when I can't go outside

3. Read after doing some other activity and make that the habit. After I go for runs or mow the lawn, I sit on the back deck and read. <-- this one seems to be the most consistent, but is a spring/summer/early fall thing here, not a year-round approach. In more temperate climates you could do this year round.