Context does matter here. If the caller would reasonably expect you to answer the phone (such as if they were calling a store or other place of business), an apology for not being able to get to the phone makes the most sense.
The answer is to ensure a customer-friendly experience for the caller – even if the call ends up in voicemail.

These voicemail ideas may not come so easily for some of you. And who says that finding inspiration is a bad thing. It’s natural; not everyone has a funny bone inside them. But that doesn’t mean you get stuck with a boring, cliché greeting. It has to be different and contain some kind of style. And to that, I would like to give you a list of messages. They are perfect alternatives when you want to add some uniqueness to your voicemail. These cool voicemail ideas given below will take the mundane effects off and leave you with fresh sounding voicemail messages. So take a look at some funny greetings that you can use as your funny cell phone voicemail ideas (or home phone).
A professional voicemail greeting is essential in many aspects of a business. In sales, it enables you to properly respond to inquiries from prospects and customers or discuss a deal in more detail. When they call, and you can’t answer, you may lose the opportunity for immediate communication and potentially lose a client or customer.