HT201436 I unlock my Iphone 4 and I upgrade from iOS 4.3 to iOS 6 from then I call make call but I can receive calls,messages,text,what's app etc

I can't make calls with my iPhone 4 after I unlock it

If the device has not been hacked or jailbroken, try the following:
Settings > General > Reset > Reset Network Settings.
Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new).  Try each of these in order until the issue is resolved.

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