I have an AT&T branded Blackberry 8300 Curve that I unlocked shortly before beginning a 6 month stay in Sweden.
I have the phone and email working with my carrier, Telenor, but I cannot get the browser to show itself. I also have an unlocked 8800 and that one works fine.
I tried the various tips mentioned in this forum (install the O2 8300 software, install the 8300 Vodafone UK software, etc) but all of them result in a hidden browser icon. Once I put in my AT&T SIM card, the browsers show back up.