Okay this is a long story so bare with me... My dad lives in the middle of nowhere and he can only get satellite internet. The problem is that his ping for his home internet is in the 800's so he uses his at&t phone to connect his Xbox to 4GLTE internet. It has been working great for over a year. We usually play black ops 2, as that is how we spend time together since we both live in different states. A few days ago he was having issues connecting to live due to sign in error. we called tech support and got it fixed. The next day he tried to get on his Xbox and he got an error stating that his NAT was set to strict and that he would have limited playability. I have called Xbox, at&t and HTC (makers of his phone) and no one knew what we were talking about. Most of the forums I have read says that an Xbox wont even connect to a phone. I cant understand why it has worked great for over a year now and suddenly it just stopped. I asked the Xbox tech guy if it was due to the new security update and the guy assured me it couldn't possibly be that. I don't know what else to do. Please Help!!