Iphone 4 hangs up when I try to call?

I gave it the recent update and now whenever I try to call it hangs up 2 seconds after it starts ringing. Happens to all contacts. Please help.

Added (1). I have a good signal. I've never had a problem.

Added (2). I HAVE GOOD SIGNAL. If you're just going to put anything saying the android is better just walk away. This isn't even my phone. It's my boyfriends. Give me an actual answer please.

That happeneds to my iPhone 4 too

Seriously I think androids are the mobile phone kings, never saw the Apple hype really but great respect for Mr Jobs. Try asking your service provider.

Check with your carrier.

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