How do i fix my samsung jet internet browser if i change my sim card?

I just change my sim card from orange to T-mobile and I've configured my internet browser but every time I try and go on the internet it keeps on saying unexpected failure.. what do I do?

I've tried to go on the T-mobile site but there is no help there.How do i fix my samsung jet internet browser if i change my sim card?
make sure you are activate your jet on the t-mobile network, it looks to me like you don't have access to t-mobile's 3G network.

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