Internet connection problem in Samsung Gt b3410?

[Digital Bangalee]

I bought Samsung Corby b3410 in 10th October 2010.
At first there was no problems in internet connection in my mobile. I got my internet connection profile or settings by sms from the operator. I have internet connection in my mobile. I can go to internet. But in January 2011, I started to face a problem with my connection whenever i go to internet it loaded for huge time and before displaying the webpage it freeze and restart. It is happening everytime i went to internet. there is no problem in my sim i can go to internet with my sim in my brother mobile Nokia 5800 or in my father mobile Nokia N85.
I thought of reset of mobile but it want password which I dont no. (My Mobile is not second hand)
So what should I do?