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.
"General" covers all missed calls ever. The "After-hours" is an additional option that only plays after your set hours (if you decide against 24/7). If you don't upload a separate After-hours voicemail, it will default to General.

Funny Voicemail Greetings. Composing these types of greetings are fun, but they aren’t applicable for some situations. You may make a funny voicemail greeting for your own personal voicemail box. However, it’s not appropriate for professional or business phones. Here are some humorous examples for you: You have reached [mention your name].
With Visual Voicemail, you can see a list of your messages and choose which ones to listen to or delete. Learn how to set up and transfer your existing voicemail. Create a voicemail password, then tap Done. Enter your password again to confirm it, then tap Done. Select Custom or Default. If you choose Custom, you can record a new greeting. Go to the Phone app, then tap the Voicemail tab. Tap Set Up Now. Enter your password,* then tap done. Record a custom greeting or use the default greeting, then tap Save.