Alright this is what happened. My friend gave me an iPhone, it was Jailbreaked and Unlocked. Me, being an idiot, accidentally updates the firmware to 3.1.3 which factory resets everything. So now the iPhone doesn't read my SIM card anymore. Reading guides on the internet, it seems I have to Jailbreak the iPhone first to unlock. But even if I Jailbreak the iPhone, it STILL will say that I need a proper SIM to get the phone to work. So I'm still stuck unable to do anything in the iPhone. So is it actually possible to unlock without a proper SIM card first? Or is the only possible way to unlock is by using a working SIM card first, then unlocking and switching SIM cards?