Wouldn't count on that cell phone in Canada.....
And in other news, http://strategis.ic.gc.ca/SSG/sf05958e.html :
Industry Canada is announcing that it will no longer authorize
the use of jamming devices. This is consistent with the Departmental
mandate to manage the radio frequency spectrum. With respect to the
use of jamming devices in connection with federal security and law
enforcement functions for national security purposes, an alternative
authorization process is currently under review.