Alternatively, if you simply want to alter your voicemail message to something else, you can do so.
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?

Enter a name for the new greeting and then tap Save. Change your greeting. To use a greeting that you've already recorded or switch back to the default greeting: On your iPhone or iPad, open the Voice app . At the top left, tap Menu Settings. In the Voicemail section, tap Voicemail greeting.
To change your voicemail message on iPhone: 1. On your home screen, tap Phone. 2. At the bottom, tap Voicemail on the menu bar. 3. Tap Greeting in the top left corner of your screen. 4. Tap Custom if you want to record a custom greeting. 5. To record a new greeting, tap Record. Tap Play to listen to it. 6. Lastly, tap Save in the top right corner.