Hi all, I've bought an iPhone 3gs second hand off ebay (apparently locked to O2 carrier in the UK). Unfortunately, certain things (like downloading an app) required a 4 digit number code (seller got it off someone else, so he didn't know it offhand, but can find out apparently), so I tried to factory reset, but that also requires the 4 digit number code. So I went ahead and installed iTunes to my PC, and tried to restore the iphone to factory settings that way. It seemed to work, and 'updated' it at the same time. But now, whenever I turn on the iphone, I get "No SIM card installed. Insert a valid SIM with no PIN lock to activate iPhone". To remedy this, I tried to go to www.iclarified.com but it's asking for the Baseband, and due to my iPhone's state, I can't find out. I can't find out my firmware number either if I need that. So how do I proceed? To clarify, I'm currently only interested in using the phone 'offline' (no phone calls) for music playing / as a calc etc.