If you use voice mail or an answering machine to answer calls when you can't, make sure that you have a professional message recorded, that does the same thing as tip #3, and gives callers any other pertinent information before it records their messages. Update your voice mail message as needed.
For those with voicemail greetings that get changed about as often as a new president is elected, know that this is doing a serious disservice to the caller-recipient relationship. It signals to callers that the business is anything but an authority, most likely not very detail oriented, and has questionable overall credibility and competency. Those aren’t traits that any business wants to associate itself.

Android phones can access voicemail by holding down the 1 key on the dial pad until the phone dials your 10-digit phone number. You will automatically connect to your mailbox and be prompted to enter your temporary password; this password is the last 4 digits of your phone number followed by the # key. Start the Google Voice app. Tap the three horizontal lines at the top left of the screen (sometimes called a hamburger menu), and then tap “Settings.” In the Voicemail section, tap “Voicemail greeting.” Tap “Record a greeting.” How do I access my voicemail? To call your voicemail on an Android phone, simply open your phone’s dial pad and hold your finger down on the “1” key. You can also call your voicemail from a different phone by calling your own number and tapping the pound key. How do you check your voicemail?
On the "Voicemail greeting" tab, click on the "Record a greeting" button to record the voicemail greetings. A voicemail's time is approximately is around 10 seconds, wait for it to finish. Once done recording, click on the "Stop" button at the center of the recording tab to end it.