An , obvious, but necessary tip. 
Make sure your voicemail is professional sounding. No songs, no “Hello……Got ya, I’m not hear right now,this is my voicemail” messages, no inside jokes, just make it professional and straight forward.
I recommend including your name in your message somehow, so that if someone calls, they know for sure that they reached your number.
I know this seems obvious, but you’d be surprised how many people have voicemails setup that would turn a recruiter or employer off the minute they heard it.
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