On your Android device, open the Google Voice app .At the top left, tap Menu Settings.In the Voicemail section, tap Voicemail greeting.Next to the greeting that you would like to use, tap more Set as active. To change your voicemail greeting: Go to Phone > Voicemail and tap Greeting. Then follow the prompts to change the greeting. To change your voicemail password: Go to Settings > Phone > Change Voicemail Password and then enter the new password you want to use.
That way you'll get to know exactly what other people hear when they call your phone and one last thing I wanted to show you. If you don't see that play on record option on the bottom, you don't have visual voicemail. Set up on your phone and that's through your provider. So if you have at and T sprint T-Mobile or any other provider, you need to have visual voicemail.

I can't get to the phone before it goes to voicemail. I understand that the number of rings the caller hears is controlled by my carrier, Verizon. My husband has a Samsung Galaxy S7 purchased from Verizon and when he calls, he hears 8 rings then it goes to VM. Note that I called Verizon and they set it to 8 rings, the maximum available.
To Reset Network Settings, begin by opening the Settings app. Next, tap General -> Reset -> Reset Network Settings and enter your passcode. Your iPhone will reset network settings and restart itself.