Hi, you have reached (names) voicemail. If you want money or to sell us something, we a) gave at the office, b) already have it, or c) don’t want it. If you are a friend, trying to give us money or just want to talk, then leave a message or try my cell phone number.
You voice message greetings are supposed to be fun, energetic, and witty so that the callers want to pick up their phones and give you a call just so they can listen to the greeting again.

Friends and colleagues speak to each using first names only. So do people of authority. They do not call each other and leave voicemail messages asking for Mister, Miss, or Mrs. Therefore, when you call a person you want to do business with and you leave a voicemail message, refer to them by their first name only. Don't say mister, miss, or misses. Don't say their last name. Begin your voicemail message by saying only "hi/hello" followed by the person's first name. Or, you can even forget the "hi/hello" and just say the person's first name. That is how you show confidence and authority and separate yourself from weak salespeople.
Where could I be? Believe it or not, I'm not home. The actor, Jason Alexander, recently customized this answering greeting for a big fan, Kat Dennings. Watch the full segment on Youtube here.