Welcome aboard the Community!
I am sorry to learn you're having difficulties with your services. Can you please answer the questions below?
Is your account in good standing?
Is this something you've experienced only recently?
Are your other services working? (text and data if your plan includes it)
If your account is in a good standing, I would suggest that you restart your phone to see if that helps. If the situation persists, you can reach our customer support channels and we'd be happy to look into it with you. We will need to access your account to determine what could be the cause. We can also send you a PM here. Let us know!