I hate it when people read a book or use their phone, it contaminates it. >:I
If you are thinking "oh well I never touch it after I'm 'cleanin up'" think again. A study a while back found that toothbrushes left exposed in a bathroom with a toilet contained traces of fecal matter, theorized to be from the splash from the toilet when flushed. If you feel up the toilet seat and whatever else then use your phone, you are asking for trouble.