Checking your beloved Smartphone too often can increase Anxiety and Panic episodes.
Something that has been investigated more often recently. And something that I can whitness first hand with various clients.
Therefore observing the scene around you or focussing on your bodily sensations instead, (while for instance waiting for the train or in any other moments of downtime), helps the Psyche to reenergize and ground itself. So it`s worth giving it a try. Even the eventually upcoming boredom can be worth observing for a while.
More about these Mindfulness techniques can be found in any kind of Zen Literature (like Shunryu Suzuki, Alan Watts etc.) or Online Relaxation Tools like "Headspace".
And apart from that... Have you never wondered what you might be actually missing out on while staring at the screen?