Hello, I use unlocked US LG G4 and I don't have a menu item in call settings for call forwarding, is there a workaround for this?

My service provider is Ultra and they can't turn off my voicemail, I don't want the callers to go to my voicemail, I never use it... is there anything I can do to either forward the calls to same number and never go to voicemail or anything else to get rid of this voicemail?


See More: LG G4 call forwarding in call settings unavailable