According to a recent CareerBuilder survey, 71% of hiring managers said the biggest mistake job candidates make during an interview is answering a cellphone or texting during an interview. Digital etiquette - including how people engage with mobile devices - is a topic that is near and dear to my heart and one that I will be following throughout 2011. So the fact that the #1 mistake of job hunters is to use their cell phones during interviews is mind-boggling. No one should have to tell a candidate that their cell phone is best left turned off during an interview; it should be a given that candidates will put away their mobile devices when meeting a hiring manager.
Since it appears that some job hunters didn't get the memo, I will summarize it for them - when you interview for a job, turn off your cell phone. Don't answer it, look at it, or use it. It's that simple. And send a thank you note - yes, it matters.