and then we tested caylen broussard s phone. 442. reporter: it was our worst. a reading of 442 means her phone contains something like 100,000 bacteria. that s really embarrassing. reporter: no need to be embarrassed. because last, we tested my phone. i think you re being particularly thorough. i am not. reporter: these old flip phones tend to trap bacteria more than a flat smart screen. my readout? 170. i feel like i should interview myself now. miss leamy, what do you think of all the germs on your phone? oh my gosh, i can t believe it, i thought i was so clean! some companies plan to sell anti-microbial coatings for phones and cases. there are simpler solutions. for example, take a little rubbing alcohol and wipe down your phone. if you re using some hand sanitizer, when your hands are