No cell phone: The same way it’s rude to have one out at the dinner table, you definitely don’t want one out during an interview.  It also must be off or on silent mode.  Even a vibrating cell phone can be really distracting and rude as you’re going through an interview. A lot of people use their cell phones as they are waiting for their interviewer.  I wouldn’t say this is necessarily a bad thing, but it’s better to observe the environment around you versus being buried in your phone.