This is a great question, sometimes the best way to prep for an interview is by noting all the things you shouldn't do. One of the biggest mistakes you can do during an interview is check your phone.
Helpful tips for Interviewing: Make eye contact Bring extra copies of your resume Know your resume really well Tell stories to explain your work experience Dress for the job you want Bring a notebook and pen, and take notes! Ask the interviewer questions Know the job you're applying for DONT Check your phone Try to have a conversation instead of an interview
Another tip, the interview starts from the moment you step into the building until the moment you leave, remember to stay 'on' until you've left the building.
Check out this article for more information: http://www.popsugar.com/smart-living/Dos-Donts-Job-Interviews-34040192 Hope this helps!