While this may seem a bit archaic compared to Visual Voicemails, it is still better than nothing. It may take a bit longer to listen to your voicemails, and you won’t have as much control over them as you would on a Visual Voicemail service, but is better than missing the call entirely.
That way you'll get to know exactly what other people hear when they call your phone and one last thing I wanted to show you. If you don't see that play on record option on the bottom, you don't have visual voicemail. Set up on your phone and that's through your provider. So if you have at and T sprint T-Mobile or any other provider, you need to have visual voicemail.

On the iPhone, go into voicemail and tap "Greeting". Record a few seconds of something and tap stop. Before you tap save, use iFuntastic or SFTP to navigate to /var/root/Library/Voicemail on your iPhone. You'll see a file called "Greeting. amr". This is the audio you just recorded. Delete that file and replace it with your custom message which should then be renamed to "Greeting.amr". Tap "Play" on the iPhone to verify your message works. If it plays, tap "Save" and your custom message will be uploaded to AT&T's servers.
Jun 30, 2014 · Problem:Â I was approached by a customer who asked me why his iPhone 5c wouldn’t ring even though he had, what looked to be, enough signal to receive a call. Â On the caller side, the phone would ring once and then go to voicemail. Â We tested and yes, it would ring sometimes and other times it would not.