What has worked out well for me is a flip phone. The modern ones have all the offline smartphone features you need to get by. Call, text, alarms, calculator, camera. I have found it to be rugged, inexpensive, and one week battery life is a great selling point.

And when I get home to my computer, the refreshing relaxation of the internet is great.

Smartphones making people dumb, dumb phones making people sane.