Voicemails are recorded on your network as audio files and are downloaded to your phone. They are then played back in the usual way, just through the phone app rather than through the music app. Any voicemails you have are visible in the Voicemail app and should be able to be played back by pressing the play icon. This doesn’t always work, though. Here are some fixes you might try.
Voicemails don’t necessarily have to be monotonous or extremely jazzy or funky. What you should be looking for is a balance between the two. Whenever you call someone and their voicemail greeting is playing, it tells you a lot about who they are, as a person. Which is why, you’ve got to put a little bit of “you” when it comes to voicemail. And the best part about all of this is, since you couldn’t come to the phone, at least the callers are having a good time listening to the message.

Deleting Voicemail Greetings from the phone is quite an easy process. You need to follow simple steps for it. Let’s check them:
1. Call your number. It's that simple. Use any landline or cell phone to dial your mobile or landline number. Dial the full number. Make sure someone doesn't actually answer the phone you are calling when it rings, though. Make sure you dial the area code with the number.