How to listen to voice mails on my iphone its not letting nr?

I'm going to the voicemail am it's not letting me listen to the voice mails it keep saying enter my pass code but I never put a pass code…

You would have to call your cell phone carrier customer care and tell them to reset your password for your voicemail.

If its a new phone then the pass code is the last 4 digits of your number. When you get into your voice mail then go to the setting you can change it.