Mood can also play an important factor in your recording. Record the greeting in a quiet place, remember to smile, and focus on leaving a positive message that’s sure to please your customers. (Tendant provides an example script you can leverage for your voicemail greeting.) Cut through the noise by speaking clearly. From honking horns to spotty cell service, callers often have their own background noise to contend with. The last thing you want is a missed message due to a lack of clarity, so make sure your outgoing greeting is clear, concise, and recorded at a reasonable pace.
When clients or customers want to learn more about your business, oftentimes after checking out your website and social media, if they have further questions regarding your products or services, they’ll pick up the phone and call.

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.
Another option is OpenPhone – you get a business phone number right on top of your cell phone with unlimited talk, text and professional features like voice to text, business hours and more. You can choose a local or toll-free number and have multiple numbers in the app.