How to extend the time of rings

[maribesito]

I need help on how to extend the ring before it goes to voice mail.  Please help Samsung galaxy 9

[KennewickMan]

Contact your service provider.

[MJFrithjof]

You will have to contact your service provider. However, this is likely impossible.

[userCpKtl7sv97]

People can not leave a message in my voice mail box. How can this be corrected so messages may be left.