Ok I have seen pockets of this issue with people trying to unlock. People including myself upgraded to 4.1.2 fw and had the baseband changed. So using redsn0w I install the ipad 06.15.00 baseband and jailbroke. After doing all that I install ultrasn0w 1.2 . I received no signal. Now here is the kicker...I have t-mobile and Att. I received no signal with both just like the rest. I have tried with the phone being hackivated and by using S.A.M. . I live in the US meaning no blacklisting so I have no idea at this point what it could be unless it's a hardware issue. What do you guys think?

Did you disable 3G on the device? T-Mobile won't work until you do this and it wasn't mentioned in your post.