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the user name and password ***** be the gmail account and the password ***** it that you used when you first set up the phone,
if you dont know the password ***** can try logging into the account on a computer and use the lost password *****
if you dont even know the account you will probably have to reset the phone to factory specs and lose everything on it.
i can give you instructions for that if necessary but its a lot easier if you know the gmail account.