Bsnl postpaid sim
My bsnl post paid registration failed in nokia 6233

I have bsnl post paid and i face problem on this, i have Nokia 6233 and the problem is my postpaid get registration failed in nokia 6233, it happens five times, Nokia gived me new one but problem still not solve, they sait this problem from your service provider.so i have request to bsnl solve this problem my number-9423474021 bsnl post paid.