Mobile Phones in the water closet

This one I really don't get. Why is it that you take a call while you
are standing in the water closet doing your business. There is no way
to be discreet about this at a public facility. What is so important
that you need to be talking while going? Not to mention the sanitary
issues! The kid today, was talking while going, then wrapped up his
business and walked right on out, keeping the conversation going. No
washing, not missing a word. I hope he doesn't let his friends use his
phone.