You can do this with lots of third-party voice recorder apps as well, like Rev Voice Recorder, Otter, and Alice, which offer some transcription. Usually for a price. The downside to this method is the quality could be sketchy. Plus, lots of people hate talking to someone on speaker phone.
That way you'll get to know exactly what other people hear when they call your phone and one last thing I wanted to show you. If you don't see that play on record option on the bottom, you don't have visual voicemail. Set up on your phone and that's through your provider. So if you have at and T sprint T-Mobile or any other provider, you need to have visual voicemail.

You will be asked to delete your current Voicemail greeting. Click on the ‘Yes’ button that appears on the screen if you want to remove that. You can save your new recorded Voicemail greeting or can use the default recorded option. Wait and hear the new Voicemail greeting message that the instructions speak out. If you want to keep that recording as your Voicemail greeting, then save it. Or you can re-record the message to get a different greeting.
That’s the simple structure of a voicemail greeting. Overall, your greeting should be professional, but the wording can vary depending on the situation. Check out a sample below.