I cant retrieve my voicemails. Won't accept my code fir voicemail
That's something to do with your carrier, not phone.
Yes, it it's something to do with your carrier. You can call them and have it reset if you would like, however, most carriers have an app that you don't even need the code to access.
So you are having a problem with calling up your voicemail, not with visual voicemail correct? Do you get an alert on your phone at least when a voicemail is received?