Website: https://forums.att.com/conversations/att-phone-features/how-do-i-change-my-voicemail-greeting-message/5defd78dbad5f2f60659eaaa
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?

Website: https://www.online-tech-tips.com/smartphones/how-to-set-up-voicemail-on-your-smartphone-access-messages/
Pro tip: You can double-check to see if voicemail is set up on your iPhone by dialing and calling your own phone number in the Keypad of the Phone app, or by calling your iPhone using another phone.