Many studies have shown that the average home toilet is cleaner than the average home kitchen sink (when dishcloths, sponges, etc., are taken into account).
Absolutely. In studies where cultures were taken from various places, toilets, even public toilets were far down on the list for harboring bacteria and viruses. Computer keyboards were among the nastiest things, as were kitchen counters and sinks.
As far as catching a virus or bacterial infection, some are airborne and some survive on surfaces for a long time. But getting sick from your own home toilet is extremely low probability, unless someone in your family is sick, in which case you do need to be very careful about any surfaces, etc.
But to get to the reason I take my phone or tablet into the crapper with me: Don't any of you ever sit for an extended period of time? Forcing things is not good for you. Gotta relax and take your time.
We have always provided reading material in our bathrooms. Back in the day, we always had a stack of National Lampoons in there because they had good material for any length of stay. One-panel cartoons, or the "readers' photos" for those quick visits, and multi-page articles for the longer trips. It was always great to hear roars of laughter coming from the bathroom when a guest was in there!
Anyhow, our phones and tablets have taken the place of print material.
This all reminds me of this episode of "Seinfeld":
https://youtu.be/NygOFsExGMU