I'm mystified by the number of people who think that they've solved the fundamental problem by getting rid of their phone: being that unable to control one's immediate impulses, is worthy of attention.
Sure, but if you're using it only to fill a gap of time because it's there, it's worth evaluating whether you really need all the enrichment smartphones offer.
If you need to give it up to put it down, then your problem isn't smartphones, and you will fill it with something else in short order.
Moreover, you are going to be increasingly at odds with your surroundings: the world is becoming more smartphone-like, not less.