Well, if you’re going to follow what I do, the answer is yes. I clean my mobile phone probably hourly. I touch it, I put it down on a surface, I pick it up and get some hand-sanitizer, and I rub it all over.
I clean my mobile phone regularly, because it’s a frequently touched surface, it’s lying around everywhere, so I’m obsessive-compulsive with that. Is it a source of infection? Haven’t got a clue.