This works for any call, live conversation, or endless Zoom call. On a second device—be it another iPhone, an iPad, laptop, or Android phone—open a voice-recorder app and hit record while you're talking. On iOS, the built-in version is called Voice Memos; we have a full tutorial on how to use it. Windows 10 has a built-in Voice Recorder. Android has a bunch of them.
Increase the odds of getting a call back by mentally composing your message before each call. And remember, people hate it when callers state their name and phone number too quickly in voice mail messages – no one wants to listen to a message ten times to comprehend simple information.

Step 1: Open the Phone app from your iPhone’s home screen and select the Voicemail icon in the upper right corner to view your visual voicemail.
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.