My voicemail does not work at all, I only see that I missed a call. How do I fix it?

[iMore Question]

When Anyone calls my number, after so many rings it just starts beeping fast like a busy line.

 

[lowlifeplayer]

I have the same problem.
Sprint in ATL on iPhone 6+

 

[Jaguarr40]

You would most likely need to call your carrier and ask them to check it, They might need to reset it on their end and your best bet would then be is to set up over again from scratch.