Make sure everything is cancelled or closed properly. Just other day I got a phone call from my parents that I got collection letter from Verizon. Apparently on their record I owed them money. I had to make couple of phone calls to Verizon to investigate and resolve the issue. I've looked at the bank statements and the bills and it turns out that they owe me money and end up i'll be getting little over 79 dollars they owed in about 4 to 12 weeks.