It will allow you to change the greeting from the regular one, and people can leave messages for you when you are not available. Apple's visual voicemail configuration is so easy on the iPhone. However, there are a group of people complaining that they forgot their voicemail password, not knowing how to reset voicemail password on their iPhones
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?

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2. Tap and hold the "1" for about two seconds until the phone automatically calls voicemail.