Definately. After Debranding Your Phone Will Be Like You Have Taken It Out Of Box. It Will Take 2 Minutes To Start For First Time And Your Entire Data Will Vanish (Not M2).
However You May Save Your Contacts In Your MS And You Might Like My Phone Explorer Which BacksUp Everything. Your Files, Messages, Contacts And Even Your Calender And Notes etc And The Best Of All. Its Free.
Download It From FJ Softwaredevelopment