Follow the instructions and press that number. You will be asked to delete your current Voicemail greeting. Click on the ‘Yes’ button that appears on the screen if you want to remove that. You can save your new recorded Voicemail greeting or can use the default recorded option. From the home screen, select the Phone app. Note: Alternately, you can set up voicemail by selecting the Phone app then selecting and holding the 1 key. Select Keypad, then select the Visual Voicemail icon. Select Start. Select Ok. From any Home screen, tap the Menu key. Tap Settings. Tap Call settings. Tap Voicemail. Tap Voicemail again. View the voicemail number. Press and hold the 1 on your device’s dial pad to call and connect to your voicemail. Press the star * key to access the main menu. Press 4 to access the mailbox options. Press 7 to change the language of the voicemail prompts to either Spanish or English.
1. Towards the top of the screen, select the trashcan icon. A checkbox towards the right of each voicemail message in the list will appear.

At present, you have to record your greeting by recording directly into the iPhone microphone -- the results of which are average, of course.
As Hurricane Florence advanced on the mainland U.S. in September 2018, a fresh batch of seemingly helpful storm-related (mis)information spread online, including a graphic purportedly offering advice to cellphone users who might soon find themselves without service: