Url changed from <a href="http://www.slate.com/blogs/future_tense/2014/12/31/snoopsnitch_is_an_app_by_the_german_srlabs_that_detects_imsi_catchers_stingrays.html" rel="nofollow">http://www.slate.com/blogs/future_tense/2014/12/31/snoopsnit...</a>, which points to this.