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?
Website: https://support.spectrumvoip.com/hc/en-us/articles/360024048493-How-do-I-change-my-voicemail-greeting

Change the message as often as you like. To add a status message. Click your photo, click Click to add status message, and then type a message, such as “In training today” or “Working on a deadline, please IM instead of stopping by.”. If it’s your first time setting up voicemail, you’ll likely see a message that says “No voicemail
Open the dial pad on your mobile phone. You can see the Voicemail hot button (in most cases, it is the number ‘1’ on the dial pad). Press & hold that button, and it will take you to the Voicemail directly. You can also go to the Voicemail from the phone menu.