I've got an iPhone 3GS on 3.1.2. I did a fresh restore then unlocked it using blackra1n because I had a Three UK SIM card and needed to hacktivate it. Once that was done, I went ahead and downloaded blacksn0w and unlocked it. The problem is that there is only a 'No Signal' displayed in the top left corner. It is baseband 05.11.07 and I know that the SIM card is fine because it works in my friends iPhone the same way. It worked in this iPhone when I did it before, but I had to restore after a friend mucked with my iPhone. Is there anything I can do? Any help would be appreciated. Thanks.