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?
If you need to set up the voicemail on your Samsung Galaxy S9, just follow this easy step-by-step guide.

To change Voice Mail (VM) greeting on Samsung OfficeServ (Samsung OS) system please follow the following steps:
19. Hi, you’ve reached [employee name]’s voicemail box. [Employee first name] no longer works for [company name]. Please call our main line at [phone number] and we’ll be happy to connect you with a current team member who can help.