4. A simple "thank you"
When people go out of their way for you in helping you with your job search, make sure to thank them. A short email expressing your gratitude and promising to stay in touch is all you need. Most college grads express poor manners in the job search process, and being polite is just one more way to stand out from the crowd.
5. Bad voicemail greetings
Ninety percent of voicemail greetings I hear when I'm calling recent college grads make a very poor impression. They sound immature and much too casual. Make sure to give your recruiters your cell phone number (so that they can reach you easily), but remember to change your greeting so that they don't hear, "Whatsup, this is Greg, leave a message." A better greeting would be: "Hello, you've reached Greg. Please leave me a message." And if the phone rings at a time or in a place that makes it hard to have an important conversation, let the call go to voicemail. Don't talk to a recruiter during, say, a basketball game.