Unable to access Internet on Micromax A78 with uninor sim card?

I have micromax A78 mobile and I am using it from couple of months.It was known to me that it will create problem but I purchased it due to its low rate.Now it shows a strange behaviour.It works fine other sim cards like Airtel,Aircel,Smart etc but whenever I try to connect internet using Uninor, nothing happens.However the internet works absolutely fine when I use the same sim card with dongle which confirms that there is no problem as far as network is concerned.Can you guess the reason or cause of error? Please help me in fixing this issue as soon as possible?

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