Get a feature phone. The name is ironic as they're rather featureless. I've done this a couple of times totalling several years. In fact, I'm getting another one this Christmas and getting rid of my current smartphone.
I pondered what were the most useful things I did with my phone and I got dedicated items for those purposes. A DSLR camera, a sat nav for the car, a high end MP3 player.
Thus, my smartphone has become redundent. The most time intensive things I use my phone for are a waste of time. Scrolling endlessly through the internet or squandering time on instant messaging etc.
I'm pondering getting a Kindle eventually too. Not a tablet though. Because, again - I want a dedicated item that serves a useful purpose - reading books and listening to audiobooks.
Of course, you could argue a phone does all of the above in one handy package, but it's quite freeing to be without a smartphone.
Ed