What a joke, can't get any help

Phone says SIM card has been changed, enter password, device is LOCKED.  I have NO IDEA what pin is/was entered.  UGH! HELP.  I didn't change SIM....BEEN TRYING TO GET SOMETHING GFROM  NORTON FOR OVER 2 HOURS, WHAT A JOKE.  i'M SICK OF TRYING TO ACCERSS BACK TO MY PHONE.  ONCE i GET IT FIXED, BYE BYE NORTON- YOU POS

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