We are way, way too late for that. We solved that problem by making sure each phone is only used by one person. So even if people poke their grubby fingers at their phones for the entire time they are sitting on their toilets, there won't be a planet-wide epidemic of a phone-vectored disease.
Did you consider that we would need to have scientists predict that the planet will be devoured by an enormous mutant star goat beforehand (or maybe a gigantic swarm of twelve foot piranha bees),and convince them about that didn't you? ;)