If you are recording a voicemail message for business, be sure you include your name and your company's name, so people know who they are calling and were they are reaching them. If you do not include the business name, they may think they have mistakenly called you at your personal number. You will also want to make sure to give callers the option to speak to someone who is currently available, an operator or other representative, by pressing a certain key (check with IT personnel to see what this might be).
If Set Up Now doesn’t appear, then that means your phone has been set to the automated voicemail option. You can change it whenever you like, though. All you have to do is tap Greeting, which should be at the top-left of the screen.Tap Record, and then speak slowly and clearly into the phone so that your message is recorded.When you are finished, hit Stop.

Voicemail greetings are simple things, and in a business, they can seem unimportant. However, a voice mail greeting gets a lot of play with customers and associates—think of how often you are unable to take a phone call because you're on another line, away from your desk or out of the office.
Voicemail used to be one of the biggest features of a mobile phone plan, but now it’s one of those features not many people use. As a matter of fact, as far back as 2014, NPR explored the reasons why millennials (and those who come after) hate the service.