I recently changed my apple ID on my mac to reflect my name change, however I cannot change it on my iphone. I continue to get pop up message wanting me to enter my password for the obsolete apple ID and when I enter what I think the password is it is incorrect. I have tried to reset it, use security questions (which can't authenticate me), have called apple four times and spent countless hours on the phone. I am at a loss as to how to change this on my phone. I would appreciate any suggestions. Thanks