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.
5. Switch on and switch off Airplane Mode. You can do this from either Settings or the Control Center. On iPhone X or later, swipe down from the top right of the screen (where the battery indicator is).

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However, some cellular service providers allow users to access and update their voicemail by calling their own numbers from working landlines or phones on other wireless networks, so users whose accounts include such an option and who have access to alternative service could keep the voicemail greetings updated even when their own mobile phones cannot connect to cellular or internet service.