Open the Phone app. Tap the Voicemail tab in the lower right-hand corner of the screen. If Visual Voicemail is not set up on your iPhone, you'll see a button that says, Set Up Now. Tap that button. Enter, then confirm a custom voicemail password. Tap Custom if you want to create your own custom greeting when someone reaches your voicemail box.
If all those steps fail, a reboot may be in order. If you have tried Airplane Mode, deleted the voicemail message, and cleared old messages, this is the next task. Try a simple reboot to see how it goes.

Voicemail is not working on your iPhone and you don’t know what to do. It’s incredibly frustrating when voicemail won’t work, especially if you were expecting an important phone call from a friend or family member. In this article, I’ll show you what to do when your iPhone won’t play voicemails so you can fix the problem for good.
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. Step One: Introduction. Start with an upbeat greeting that includes the name of the person you’re calling: “Hi, Tim!” “Hello, Susan!” “Good morning, Tom!” Then, introduce yourself by giving your name, company name if applicable, and telephone number. Step Two: Message. Step Three: Recap and sign off. What is a professional voicemail greeting?