The iPhone is completely secure, a little big because of the protection, but it's nothing compared to the security it provides. This article was top would if the voice control does not activate all the time, in fact with the protection, the "home" button bcp is more sensitive, therefore it is in hand, and that exerts light pressure, however small it, the voice control is active, and therefore the iPhone starts to call or do anything else as he understand with different ambient sound, and as we can disable the voice control (aside apparently jailbreakant), it is difficult to keep it in your pocket ...