I have used redsn0w to jailbreak the iPhone, and also to upgrade the baseband to 06.15.00. I then did, as indicated on several web sites, ran ultrasn0w to unlock it. However, when I insert a SIM for T-Mobile, it goes into a forever "searching" mode. The SIM that I want to use is for the UK, but I was able to get another T-Mobile SIM for local use, but neither seems to work! Any suggestions would be welcome!! Thanks
