Got a new iPhone 3GS from Apple after I bought a used one on ebay and bricked it, friendly seller still had Apple care on it. Don't need it any more so I want to re-sell it as new, but want to get a little more money for it by unlocking it. It's running iOS 5.0.1 and is running an unsupported unlock baseband; 5.16.05 and I have the option to upgrade to the iPad baseband which IS supported. Problem is I unlocked the other iPhone 3GS with the iPad baseband, lent it to someone in Canada and he said it didn't work. I have no T-Mobile SIM card to test it on, only AT&T. Help?