Hi there! I was coming from Japan to Europe with my Softbank-iPhone 4. I've jailbreaked / unlocked it before and thought that I could do it again without any problems. I got a SIM-card from the telephone shop but then found out that I could not unlock the phone because I already updated to 5.1.1 with an un-lockable bandwidth. Well... I've organized another iphone now, a 3GS on 5.1. I've put the SIM inside but I can not get it started because the SIM is not compatible. It needs to be jailbroken and then unlocked. I don't care about the system either, so if there's any possibility to completely erase it, to completely brick it, and put an old system on it and then jailbreak and unlock it (without compatible SIM), that would be great... Q1: What's the best way to unlock the 3GS? Q2: Is there any way (I didn't find any) to put an old IOS on the iPhone4 to be able to unlock it? Thanks for your help!