If you don’t make any changes the default iPhone voicemail message is pretty bland and not very professional. It is a good idea to change the iPhone voicemail message to something more professional or at least something that lets callers know they reached the right person.
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://info.montgomerycollege.edu/_documents/offices/information-technology/services/quick_ref_guide_voicemail.pdf
1 How do I reset my voicemail on Android?2 How do you set up voicemail on an Android phone?3 How do I change my voicemail message on my Samsung?4 How do I delete my voicemail greeting on Android?5 How do I delete voicemail on Samsung?6 How do I turn off voicemail on Samsung?7 How do I disable my voicemail?8 How do I switch off voicemail?9 How do I block voicemail on Android?10 How do I switch on voicemail?11 Why is my voicemail not working?12 How do I find out what my voicemail password is?