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I mean, if you want an answer to that you could just stop using your smartphone for a few weeks and see what your brain comes up with. Here's a short list of some examples that were popular when I was a kid and smartphones did not exist yet:
Magazines, the daily newspaper, books, going out and exploring, shopping at malls, doing a hobby or craft, personal projects, television, chit-chatting with friends or even strangers, video games, puzzles, play with your pets, exercise, play sports, sitting quietly and being alone with your thoughts.
For toilet time there was riveting reading material such as: Shampoo ingredients. Hand soap ingredients. Bodywash ingredients. The latter two assuming it wasn’t bar soap.
Maybe someone was around to bring you a magazine… or tell you to hurry up and finish and get it yourself.
Clearly I don’t read even now, as my comment is a more or less the same as others here, and a day late.