Your problem is that the AT&T towers are looking for your other phones IMEI call AT&T tell them you are having this problem and want to change the IMEI for your device, once they change this everything should work. IMEI can be found either in the phone under the battery on that sticker, or on the side of the box on proof of purchase sticker

I bought my phone last Friday and i am having the same problem. I can not access the internet giving me a "Forbidden" message, how do you get around this?

I'm tired so Im gonna do this quick.

I just bought a new Samsung Impression, and I put in my SIM card from my iPhone 3G.

Now, I have unlimited data and texting on my plan.

But the thing is, if I try to go onto the MEdia Net browser, the progress bar completes and a message box comes up saying "Forbidden". Also, none of the Java apps on my phone can access the internet. When I go on the MEdia Net java app, it says "MEdia Net is restricted by parental controls". Idk if this is the right way to do it, but from what the manual says I have to go into the CV app on the menu. CV takes you straight to the browser, where it loads the page and then says "FORBIDDEN".

So how the hell can I fix this?

If you need anymore info just lemme know, I'll get back to u as soon as I can.