GPRS applications(like opera,messengers) not working properly

I am a newbie to this forum....i dint know where to post my questions....
I have a problem with my opera mini in my Nokia 3120 Classic.

I am not able to access internet eventhough the settings are correct and i have confirmed it with my mobile operator.

When i open opera mini, it is saying that
"FAILED TO CONNECT TO THE INTERNET. GOTO
http://help.opera.com/mini/ with your desktop browser or contact your service provider for internet settings"

But the same sim card is working fine for internet in other mobiles. It is not working only in my mobile. The error number displayed is 3.1.4

I have been trying for this and got frustrated. It would be fine if someone helps me. waiting for an answer.......................................Thanks in advance