I recently purchased a supposedly unlocked 32gb iphone 4 from Jayro27 - Jerome Riley:

I met him in person to complete the transaction. He assured me it was factory unlocked and purchased from the Apple store in Fairview Mall and also provided a receipt as proof. I bought the phone and was happy with everything until I tested it with different microsims a week later and found it the phone was actually locked to Rogers. I called Jerome about this problem and spoke to him about it once. Since then he has not returned any calls or emails from me.