I'm sorry this is probably asked 100's of times a week but i can't find any clear answers on the forum or the internet. I have a Iphone 3g that is unlocked and jailbroken running 3.0.1. For some reason once or twice a month my phone will say it has signal but nothing can be done on the phone that has to do with the mobile network. This is why I feel as if i should upgrade. Hopefully it will solve this issue, because getting signal to come back takes, a couple hard restarts and usually syncing with my mac. I have watched some videos online that say that i can go into cydia and download blackra1n install the source and it will unlock it but i'm pretty sure that is after you update the OS to 3.1.2. Can someone shine some light on this for me? If there are any walk throughs for my situation that would be great. Thanks in advance.