In the United States, for emergency calling service using location data (locally called "Enhanced 911"), it was required that at least 95% of cellular phones in use on 31 December 2005 support such service.
在美国，紧急电话会使用位置数据（当地称为“增强型911”），它被要求在2005年12月31日时，至少95%的蜂窝电话支持这个服务。