Different Apple IDs on new devices
Each time I received a new Apple device I used a different Apple ID. Now I am trying to have all my devices setup with the same Apple ID. When I try to change my Apple ID, I receive a notice saying, "This Email address is not available. Choose a different address." How can I setup all my devices with the same Apple ID so information is share across my devices, MacBook, iPhone, iPad
iPhone 5, iOS 10