http://www.troyhunt.com/2013/04/your-mac-iphone-or-ipad-may-have-left.html Please note: This isn't a flaw in Apple devices. This would happen with any device treated this way. It's only common in Apple devices when demoed at the store before leaving. In short, if you buy a device at an Apple store and they set it up/demo it for you before you leave, they often connect it to their internal wi-fi which has no password. Later, if you're roaming the streets, if you happen upon an access point named "Apple Demo" your iOS device or computer (please don't wander around with a Mac Pro!) will just connect to it since it's connected before even though it was a different point. The article gives ways to fix the issue should your device have the issue.