I'm trying to unlock an iphone 3g running 3.0 firmware. I activated and jailbroke it through Pwnage Tool. When jailbreaking and unlocking 2gs from this point all I have had to do is pop in the non atnt sim and will read it. This seems to not be the case with the 3g. After I put the T-Mobile sim in it will just show the carrier bars with no signal and no t-mobile logo. What I am doing wrong here???