My "buddy" moved, still has his receiver connected to the internet without any problems. His phone line is disconnected.........
I have two thoughts on the matter. One, DirecTV really doesn't care. Two, IP addresses rarely show the exact location, it's usually a general area (Unless the ISP is questioned via court order/subpoena). If I check mine via one of the many IP lookups available it shows I'm 75 miles from where I really am.....