Users often don’t invest enough time into their messages, resulting in incomplete, unprofessional, or otherwise under-whelming greetings. Sure, crafting a greeting doesn’t sound all that complicated; however, there are a number of pitfalls users can fall into—i.e. informality, terseness, sincerity, lack of direction, and more. While none of these sound too catastrophic, they are often interrelated. As such, they tend to worsen any problem. For example, humor can cause informality, worsen ambiguity, and weaken sincerity. That being said, users should strive to avoid ALL these pitfalls.
You have reached the voice mail box of (your name). If you’re a hot chick/guy, you may leave a message at the tone. If your one of (your name)’s friends, you may also leave a message at the tone. If you’re not hot and not one of (your name)’s friends, call back when you are. Hello. I’m sorry I didn’t answer your call.

“Hi, thanks for calling the office of (insert your name). I’m away from my desk or out of the office. Please leave your name and number, and I’ll return your call as soon as possible. If you need immediate assistance, please hang up and reach our customer support team at (insert phone number). Thanks, and have a great day!”
Find out WHY a professional voicemail greeting is so important: Why You Must Have a Professional Voicemail Greeting. Hello, thanks for calling (name), I’m unable to answer your call at the moment. Please leave a message and I’ll return your call as soon as possible. Thank you.