I am considering purchasing an iphone which the seller says is from China. Box looks normal, ie rectangular, not flat, phone says on the back "designed by Apple in California, assembled in China" but there is no warranty with it as it was a gift. Yet there is this little niggle - because its a Chinese iphone - could it be fake? Can you buy unlocked iphones from China? This one is sim free and states it is factory unlocked. I know you can from Hong Kong, but is it the same in China? Is there a sure-fire way to tell if this is the real thing? It all looks ok from photo. Thanks