I'm in a similar situation; just received a brand new iPhone 4 bought from ebay, locked to 3 network (at least according to the seller). I connected to my Macbook, and can't seem to get beyond the 'No sim detected, install sim with no pin lock' screen on the phone.
So, a couple of things:
1) If I follow the advice above, hopefully 3 should be able to unlock the phone for a small fee...
2) I'm currently on 02 simplicity, and want to continue with this; so once I upgrade to a an iPhone micro sim, what should I expect to happen once I place it in the phone i.e. what should appear on screen at first? Or, indeed, when I connect to iTunes? (sorry if that sounds like a stupid question!). Currently in iTunes the iPhone icon appears in the side column, but an error message appears telling me there's a problem connecting to the iTunes Store; I'm guessing this is because the phone is locked and/or has no sim in?
3) I also travel to Ireland regularly on business; presumably once my phone is unlocked by 3, it will be possible for me to swap in a PAYG iPhone sim from an Irish network, without any problems?
Sorry, all a bit new to this. Would appreciate any advice.
