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?
So as you could see on top is buffering. So I got to wait a minute and then once that's done, I'm going to press custom here. So now when it says to set your outgoing message, I'm going to choose custom here and I could basically press record. I don't have one yet. So if I did, it would allow me to play it and listen to it.

2. Dial your carrier’s support number. This can be obtained from their official website.
It's in the upper right corner of the screen. Then you have to re-enter the new password. Please be careful, you need to enter it exactly as you did the first time. Or else, you have to reset the password.