Hello, I'm a new user to the android forums and wish to be a part of this well numbered community. Well that said, I would like to obtain information on a subject that has crossed my mind. I have noticed that some applications that require a registration process (such as heywire) take some type of information about your device or hardware. Now I know there are plenty of apps that will take such information (because when I uninstalled heywire and later re-installed it it told me I had an account already. An some applications do this regardless of a different ip address. I have no problem with this but am puzzled by this: what if I sell my desire z and the guy/girl that purchases it installs the app heywire or some app the device was already registered to? Will they be able to create a new account or will the app tell them that an account already exists for this device? Same thing goes if I want to buy a second hand android. So I guess my two questions are: will a person who buys a second hand android and downloads an app that the previous owner had and his device was registered, will be denied the possibility of creating an account? Is there a way to un-register a device that was registered by its previous owner to a app like heywire or whatever app that does such actions? Thanks to whoever will answer this question.