I already moved out of US by 2009 November and when I moved out I paid all outstanding bills from AT&T (was confirmed by the outlet where I registered for unlocking my phone). Unfortunately over the last 1 year or so (which is like 5 years after the account was closed), i have been keeping on receiving letters from the collection agency about an outstanding debts. I tried contacting AT&T regarding this and they dont have any details regarding the same and the collection company asked me to contact AT&T. I keep receiving this mail at an emergency address I submitted when I moved out of US. I dont understand where the collection agency get these information from. I am worried not only about the outstanding debt which I am sure I am not responsible for, but also about the privacy of my details and how they achieved to gather these information.