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?
Please keep in mind that normal airtime charges will apply for the time you spend setting up your voicemail.

While it is understandable that not everyone likes to use the default voicemail greeting messages on their devices, there is a simple and quick way to alter the voicemail greeting on the Samsung S20 from any carrier (including Verizon, AT&T, T-Mobile, Spring, and others).
But this is not necessarily the case, a spokesperson for AT&T Wireless, Tova Kline, told us. “There is no data or talk charge for changing your voicemail. However if you lose phone service, you won’t be able to update your voicemail message,” she said.