Hey everyone. I've just bought an iPhone 4S which was locked to O2, but he said it might be unlocked but he was unsure. I assumed that when trying a sim, if it was unlocked it would come up with this message and you'd only get one bar of signal, as shown here. But when I put a 3 simcard into the O2 iPhone, I got this message, along with 4 bars of signal. Also notice it's giving me the option to try again. (Also if WiFi wasn't on, it shows the 3G sign at the top and attempts to activate over 3G, giving the same message. So what does this mean, I was hoping that means it's unlocked seeing as it's a different message. What does it mean? Thanks.