At first when I thought that i coulen't jailbreak my iphone 3G cuz it was running on 4.1 but a friend of mine at school told me about Limera1n and it could jailbreak 4.1. I just downloaded it and but as i was running threw the instructions, I read that to not jailbreak it if it hasen't been unlocked. i don't really know what it is to unlock an iphone and will like to know and also wat program will I need to use. i heard that i can use Pwngetool or something like that. thank you