Can't surf web with unlocked lg insite

I recently unlocked an at&t lg incite phone,upon inserting my t-mobile sim card,I am unable to surf the web,email,text or use any of the phone features with the exception of making and receiving phone calls.I have a unlimited web data plan for the g1 phone,what's the problem. please help.

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Unlocked phones do not have the proper settings for the system you are using.

SO how can I fix it.There has to be a way to change the settings on my phone[lg incite],which runs on a similar program as the t-mobile mda, so I thought.

There probably is a way to change the setttings. It may be in the file system of the phone, in the phone settings or in the phone firmware. Unless you or someone else knows how to change those settings, you may be out of luck.