The ability to deny service to a blacklisted device already is part of the GSM standard and the central registry needed to get this working:
Now it is only a matter of getting the carriers to actually use this list to deny service. In most SGSN, all it takes is changing a config flag.
Yes, that hard!
"I got everybody to pay up front...then I blew up their planet." "Now why didn't I think of that?" -- Post Bros. Comics