My iphone 5s can't make any call
My iphone 5s suddenly can't make any call. Other features seems working completely fine. I can text,facetime,surf the net, using wifi,receive call etc. The only thing that i can't do is make a call to anyone. Whenever i tried to make a call it's always show "call failed" immediately. I've tried reseting the network : nope. Tried re-inserting simcard : still fail. I update my iOS version to 8.3 three days ago and i just realized i can't make any call today since i didn't need to call anyone after the update. Any help?
iPhone 5s, iOS 8.3