My iPhone is not receiving any calls?

My iphone was working fine till about 2 days ago. I didn't change any setting and it just suddenly stop taking calls. I turned it off/on, Reset the setting, changed my carier to Vodafone instead of 'Automatic' and still the same. Best answer to the one that helps!

Check your call divert options.

If your in australia vodafone is s*h*i*t house i don't get calls and i carnt make them