Step 7: If you want to record all the calls you make or receive, select the All numbers option. If you wish to record calls from the numbers that are not saved in your contacts, select the Unsaved numbers option. You can even choose some select numbers manually that you wish to record calls to and from by clicking the Selected numbers option, then tapping Auto record numbers, and then add the numbers that you desire by typing them manually or adding those numbers from your Recents or Contacts lists.
But now I'm going to go ahead and record. So press record sorry I missed your call. Please leave your voicemail after the beep and I'll call you back. Thank you. Press stop and now. I could press play and then if I don't like what I hear, I could press record one more time and when I'm satisfied, I could press save on the top right and it's going to save my greeting and that's all I have to do to set a new voicemail on my iPhone. You could always come back to this page. Press record one more time and replace your voicemail here. You're greeting here, and you should always use someone else's phone to call to see how it sounds from a different device.

Your voicemail greeting can make a positive or negative impression on people. By considering your target audience and tone, you should be able to keep it positive. Length: Don’t make people wait minutes to leave a message. Apologies: If people expect your to be available, apologize for missing their call. Set expectations: Let people know when they may receive a callback, but be realistic. Accuracy: If you change your voicemail for things like holidays, be sure to update it when needed. How do You Set Up a Business Voicemail?
5. Tap Default to use the prerecorded greeting, or Custom for a personalized greeting.