Guys, I hope you can help me. I've trawled the web and I can't seem to find a conclusive answer to my problem. I have been given an iPhone 3g with IOS 3.1.2 that has been jailbroken along with the iPad 6.15.00 baseband firmware. The original network carrier was O2 (UK) and I was told when I brought the phone that it was also unlocked. I notice on my dashboard there is a cydia icon and a Blackra1n icon. For some reason though whenever I put an additional nertwork sim card in the phone, the phone does not register the network so I assume that the phone has not been unlocked? Can somebody please point me in the right direction to what I should be looking at doing next. Thanks in advance.