Voicemail is not working on iPhone 6?

When I click on the Phone option on my phone there are five selections on the bottom of my screen that I can choose from. All options I'm able to click on and it leads me to its page but when I click on the Voicemail option nothing happens, it just stays on its current screen. Also, when people call my phone it doesn't give them the option to leave a voicemail it just continuously keeps ringing.

Your voicemail is not set up and needs to be set up in order for callers to leave you a voicemail or it just will keep ringing.

When I click on the voicemail tab there are messages. When I click on the phone number that called, the number highlights but the start arrow does not highlight and I can't listen to my voice mail. What do I do

When I click on the voicemail tab there are messages. When I click on the phone number that called, the number highlights but the start arrow does not highlight and I can't listen to my voice mail. What do I do

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