I was recently having trouble with my iPhone, it's a 3gs which I had had unlocked by someone advertising on Craigslist. A couple of weeks ago it went into DFU mode and I was getting error messages every time I tried to restore it. Unfortunately I had just moved, didn't have to the internet yet to look into it, or the technical know how. So as a result I made the mistake of taking it in to Apple and they updated me to iOS 5 which I was of course informed of afterwards can not yet be unlocked. After a lot of messing around in other forums and tutorials I managed to downgrade to 4.3.5. It won't go past the screen that allows me to make emergency calls, and iTunes says it has no SIM inserted (even though I have a Rogers sim inserted, I had it unlocked to run on Telus). My question is can 4.3.5 be unlocked? I had no idea what iOS I was running before the fiasco. Please please help me, I cannot afford a new phone.