I have the problem of calls getting failed.. Black Iphone 4S 16gb IOS 6.1.3. O2 Network.  Airtel India.     I have full bars of signal but cannot  make calls. Goes to "No service" then to "searching".     I constantly get "Call Failed" when making calls.

I have the problem of calls getting failed.. Black Iphone 4S 16gb IOS 6.1.3. O2 Network - Airtel India.
I have full bars of signal but cannot  make calls. Goes to "No service" then to "searching".
I constantly get "Call Failed" when making calls.
What could be done to solve the problem?

Try settings/general/reset/reset network settings.  If that does not do it then contact your carrier

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