Letting callers know to leave their name and number so you can call them back is an excellent way to get the right information that you may need from someone that you missed a call from. Otherwise, you might be left with a number with no name to ask for or vice versa. If you run a business and want to include something that usually comes up in professional phone calls, include that as well. For example, if people often ask you to check on business orders, ask them to leave the shipping number so you can get back to them with a ready response.
"Voice mail has lost its appeal primarily because it's very much tied to the notion of the phone and your communication being tethered to a physical thing or a physical location," he says.

The above section details types of phrasing to avoid; however, it doesn’t detail what users should NOT say on their greeting. Though this is a bit loaded, as there are hundreds of combinations of things one shouldn’t say, there are some key components users should ALWAYS avoid. a. Forget About Slang: You should strive to be as professional and welcoming as possible in your greeting. While this may steer you towards using slang, in an attempt to make callers comfortable, it’ll most likely work against you. As a professional, your demeanor, tone, and speech should be clear cut and well articulated. Using slang undercuts this and works against you. b. Don’t Even Think About Profanity: This is a no-brainer. Never, under any circumstances, curse in your greeting EVER! c. Keep Your Sentences Clean, Don’t Ramble: Introduce yourself and give your caller specific direction. Avoid long diatribes detailing tangent thoughts. Keep it simple and quick. d. Always Return Your Calls: It’s important for callers to feel they are valued. Nothing dissolves this quicker than a greeting that doesn’t stress this. For example, “I’ll call you when I can,” “If I don’t return your call, please call back”—these phrases are terrible and completely destroy any good will you may have with a caller.
It's as much a truth with residential phone service as it is with business communications, though those numbers are much lower. Voice over Internet Protocol (VoIP) phone service provider Vonage reported in April that voicemail deposits among its residential customers had dropped by 8 percent since October 2013, and retrieved messages were down 14 percent.