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.
In many cases, an update to your carrier’s voicemail app or settings can resolve the issue, but don’t forget to call your voicemail number to check if it is set up correctly. Once you’ve set up your voicemail, you’re free to switch off when you need to. There are other ways you can stay in contact, however.

Note: If the Phone option is not present, slide up from the center of a Home screen and select Phone.
AT&T and other wireless service carriers have revealed a series of preventative measures to help maintain phone service as Hurricane Florence approaches the mid-Atlantic region, including the use of wireless “flying COW” (short for “cells on wheels and wings”) drones that can maintain connectivity for up to 40 square miles once they are activated.