To set up your voicemail, press #55 or *68 from your home phone or call the retrieval number you received with your welcome letter. Voice prompts will guide you through the rest of the steps.
2. Once there, tap on "Greeting" in the top-left corner. Your iPhone will take a few moments to fetch and load your current voicemail greeting, which you can play using the controls in the middle of the page.

Setting up visual voicemail on an iPhone is straightforward. First, check if your carrier allows for visual voicemail; many major providers do.
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.