Consider for a moment how your phone is currently being answered. Professional courtesy is quite often not the standard for many college students. An abrupt "Yeah!" could be listed among the more courteous greetings. The more outrageous remarks will often buy you a major black mark in the professionalism category—even if it was your roommate answering your phone and acting crazy. A simple "This is ____" is always a pleasant change for a college student call. Make the change today, before the next (or first) employer phone call. If you have a landline, you should also encourage your roommate to do the same.
8. Let Your Callers Know What To Tell You. This tip is more for you than your callers. It’s particularly helpful if you need more information than the standard name and phone number.

Some of us may still remember a time when voicemail was a blank canvas for pranksters and humorists. They would use voicemail greetings as a place to begin recordings as if they were answering the phone (“Hello? I can’t hear you… Just kidding! Leave a message…”) or to flash some personality with music or themed messages. Unless your business is a costume rental facility or joke and magic trick shop, it’s best to avoid this strategy. Instead, try to remember a few key points to focus on-
Don’t be fooled by other business’ mediocrity…Excellence matters. First impressions also matter. Let your clients and investors listen in on just how exciting and professional your business really is.