Obama administration fights for right to use cellphone kill switch:
For nearly a decade, the U.S. Department of Homeland Security (DHS) has maintained a policy for unilaterally shutting down private cellular service, over an entire metropolitan area if necessary, in the event of a national crisis. Ref. Source 1
There are pros and cons to this I suppose with the biggest con being that those in distress or in need of medical help will not be able to call for help!
International Level: Activist / Political Participation: 34 3.4%
When the government wants to impose laws like this its purely from a military / security angle and not civilian.
International Level: Junior Politician / Political Participation: 67 6.7%