Fixing these kinds of problems is a process of elimination. There is no single fix for all voicemail problems so trial and error is the theme of the day: try one of the solutions below and then retest. If it works, great. If it doesn’t, move on to the next possible solution.
10. Reset Time Zone and set Date & Time automatically. For most users, it’s recommended to let your device automatically set the time. To make sure that your time zone and similar settings are correct

After setting the number on your voicemail, you must also record a personal voicemail greeting. Follow the steps below. Start the Phone app. if you don’t see the numeric keypad, tap “Keypad” at the bottom of the screen. Tap and hold the “1” for about two seconds until the phone automatically calls voicemail. Immediately tap “3” to access voicemail settings. Listen to the options. On most voicemail systems, tap “2” to start the process to record a new greeting. The current personal greeting will play; then tap “2” again to record a new greeting. Say the greeting you want, and tap “#” when you’re done. To save the greeting, tap “1.” The personal voicemail greeting has been set. Hangup the phone. How to setup voicemail using a Visual Voicemail Applications
Just NowVisual voicemail does exactly what it says on the tin. It allows users to view their voicemails on screen, and to choose, out of a list, which voicemails they want to listen to and which ones they want to skip over. Since its inception in early 2007, visual voicemail has taken on many forms, and has increased the productivity of hundreds of thousands of individuals and businesses around the