my phone (Samsung Galaxy Ace) was accidentally knocked to the ground, it didn't hit the ground too hard, I almost caught it about 2 feet off the ground but it bounced out of my hands (if only I was wearing my ball glove!), but it hit hard enough that the battery came out. when it powered back up it is asking me for a network unlock code? I know my phone was an unlocked phone but I have been using it for months with no problems. I have taken the battery out a few times and never had this happen. Why does it need to be unlocked again?? and how do I unlock it??