The telephone systems have the feature named as Voicemail. VoIP is the best example of it. When a receiver is unable to pick up the phone, then the caller can leave the voice message on the receiver’s phone. In older telephonic machines, such messages were stored as a voice message directly, and the receiver can hear them later. In modern telephone systems, such info is being stored on the server of the service provider in the user’s mailbox. It is similar to email in which the messages are saved in the form of audio instead of text.
AT&T and other wireless service carriers have revealed a series of preventative measures to help maintain phone service as Hurricane Florence approaches the mid-Atlantic region, including the use of wireless “flying COW” (short for “cells on wheels and wings”) drones that can maintain connectivity for up to 40 square miles once they are activated.

You can set or change your PIN for your voicemail box if desired Toggle to play the voicemail message date on or off as desired Decide if you want to receive an email and/or sms notification when you receive a new voicemail message.
When you first set up your Android phone, it may ask you to record your greeting for the caller. You can also keep the default greeting stored on the device. But, in future, if you want to customize the Voicemail greeting or want to create a new one, then you may need to delete the old recordings from Android. It may not be necessary depending on the Android device model & version; it’s good to know the process.