Since you are recording audio, make sure you are in a silent place or a place with minimum background noise. This will help you create a perfect business voicemail greeting clear.
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?

Go to Settings > Phone > Change Voicemail Password. You can then follow the prompts to change your Voicemail password.
Each carrier has a different method for setting up voicemail, and we’ve provided a brief description of how to do it (and where to find instructions) where applicable below.