[pheldagryph]

Meditation and mindfulness can be used as a direct replacement for smartphone usage to kill time, in all such situations.

Seriously, this is a very good thing to do. All those annoying meditator-commenters on the Internet are right.

https://www.mindful.org/meditation/mindfulness-getting-start...

...but my most common smartphone time killer is reading long-form articles I've emailed to myself.