Outgoing is off

Sir,

I have an issue with mobile since last 3days.
I am unable to call anyone, when i am trying to call its giving me a message service unavailable.

I am using samsung corby mate. This morning i receive a call from bsnl office about some configuration changes. they told me to do some changes in network services -> dial number that’s it. but i dont find network services area in my phone.
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