A flaw in iMessage has been allowing stolen iPhones to continue receiving and sending messages for their original owners, even after a remote wipe, reports note. Although iMessage is also nominally associated with a person's Apple ID, changing a linked password and/or email address may have no effect. It's believed that iMessage may be pulling old phone numbers from a cache, and using that data to manage messages. Switching a SIM card to a new iPhone may in fact take iMessage traffic with it.