Note8 calls going straight to voicemail and unable to make calls

[Android Central Question]

Every now and then my note 8 won't make calls and all incoming calls go to voicemail, then when I call voicemail, I'm unable to retrieve the messages. Any advice?

 

[h2ofun]

If I am sometimes near a computer, my phone does not "ring" but I have a message in voice mail.
No technology is perfect.